You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you at present?

USER: Can you please help me in changing my recent reservation? As my planned trip has been postponed to some other dates.

ASSISTANT: Sure, May I know your name please?

USER: Sure, my name is Margaret Allen.

ASSISTANT: Ok, please wait for a couple of minutes.

USER: Sure, I'll wait.

ASSISTANT: Sorry to inform you that, we did not find any reservation on your name to change it.

USER: Oh! May be I did a wrong booking. Thank you anyways.

ASSISTANT: Thank you for availing us.