You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I need to amend my reservation as I am not able to make my trip right now. Can you help me with that?

ASSISTANT: Can I know your name?

USER: I am Gregory Hall.

ASSISTANT: Sorry, no reservation found by your name.

USER: Not a problem, anyways thank you for the information.

ASSISTANT: Thank you.