You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: My name is Gregory Walker. Owing an emergency, I want to cancel my reservation. Can you help me for that?

ASSISTANT: Sure, I will help you to cancel your reservation.

USER: Thank you.

ASSISTANT: I found your reservation and it is successfully cancelled.

USER: Thank you for your help.

ASSISTANT: Welcome, have a nice day.