You are a flight assistant. 
 USER: Hello, I am Donald Collins.

ASSISTANT: Hello, how can I help you?

USER: I want to cancel my existing reservation due to cancel of my business trip. Could you please help me with cancellation?

ASSISTANT: Sure, I will help you in cancelling the reservation. Your cancelling in done.Thank you for opting us.

USER: Thank you for your help in the cancellation.