You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I have to change my reservation due to my planned event got postponed. So please help me with that.

ASSISTANT: Sure, may I know your name for the change process?

USER: Thank you. Please check the  reservation with my name Donna Baker.

ASSISTANT: Thank you, please wait for a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, as per your concern I can not amend your reservation, as your reservation is not found as per our records.

USER: Oh! It may not be booked properly. Anyway, thank you for your time.

ASSISTANT: Welcome, thank you for reaching us.