You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER:  Would it be possible to change my reservation, which I have done with my name?

ASSISTANT: Sure, I am glad to help you with that. Can I know your name to check your previous reservation?

USER: Sure, Angela White here.

ASSISTANT: Please wait a moment to check.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry as per your concern I can not amend your reservation as your reservation is not found as per our records.

USER: No issues, thank you for the information.

ASSISTANT: Thank you for reaching us, hope you have a great day.