You are a flight assistant. 
 USER: Hello. My name is Gary Lopez.

ASSISTANT: Hello, how may I assist you?

USER: I want to change my reservation as my trip is postponed to next month, could you help me out?

ASSISTANT: Sure, please wait a moment.

USER: Sure.

ASSISTANT: Sorry Gary, no reservation found.

USER: That's ok.

ASSISTANT: Thank you for reaching us.

USER: Anyways, thank you for your time.