# How Grab Experimented with Chat to Drive Down Booking Cancellations

[Grab](https://yomu.fyi/company/grab) · Ishita Parbat · Mar 1, 2018

**Type:** Problem & solution

## Summary

Post-allocation ride cancellations at Grab degrade the booking experience and create costly inefficiencies for both passengers and driver-partners. Internal user research and platform data confirmed that rides involving GrabChat conversations had significantly lower cancellation rates by reducing perceived wait times. To scale this interaction without extra cost, the team tested system-generated automated messages sent at varying delay intervals, styles, tones, and localized verbiage across different cities. Faster message delivery outperformed longer delays, and tailored prompts reduced booking cancellations by up to two percentage points across tested markets. The experiment demonstrated that high-quality, directed prompts solicited quick responses and improved pick-up efficiency even when overall message volume was lower than control groups.

## Context

Post-allocation booking cancellations at Grab represent an unpleasant, costly problem where high-intent rides are abandoned after price agreement and driver matching.

## Approach / What changed

Deploying system-generated automated GrabChat messages upon ride matching, testing varying message delay intervals, tones, localized phrasing, and question styles across different cities.

## Takeaways

- Sending automated GrabChat messages sooner after driver matching was more effective at preventing booking cancellations than longer delays.
- Targeted automated messaging interventions reduced booking cancellations by up to 2 percentage points across tested cities and verticals.
- Quality of engagement proved more impactful than message volume, as concise direct questions drove meaningful responses despite lower overall message counts compared to control groups.

**Tags:** [Testing](https://yomu.fyi/topic/testing)

[Read original post](https://engineering.grab.com/experiment-chat-booking-cancellations)