You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Due to some reason, my music concert is postponed. So, can you change my reservation?

ASSISTANT: Sure, I will help you with that. May I know your name please?

USER: Sure, myself Edward Clark.

ASSISTANT: Clark, no reservation has been found on your name in our records.

USER: It's fine. Thank you for searching.

ASSISTANT: Thank you for choosing us.