You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be at your service today?

USER: Can you please help me in doing some modifications in my recent reservation? As my planned trip has been postponed.

ASSISTANT: Sure, we are here to help you.

USER: Thanks for that.

ASSISTANT: May I know your name please?

USER: Sure, Brian Wilson here.

ASSISTANT: Please be on hold.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name.

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

ASSISTANT: Thank you for opting us.