You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am David Carter.

ASSISTANT: How can I assist you?

USER: I need to amend my reservation, can you help me out please?

ASSISTANT: Yes, may I know your travel dates? I will amend if I find.

USER: Can you check my any active reservation?

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for waiting and I could not find your name in our reservation records.

USER: That's ok, no problem. Thank you for checking.

ASSISTANT: Thank you for connecting our agency.