You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Gregory Hall.

ASSISTANT: How can I help you?

USER: I want to cancel my reservation, can you help me for that?

ASSISTANT: Sure, I will help you to cancel your reservation. Can you help me for that?

USER: Thank you.

ASSISTANT: Sorry, no reservation found on your name to cancel your reservation.

USER: Welcome, have a nice day.