You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your good name please?

USER: Sure, my name is Donald Philips.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your given name.

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

ASSISTANT: Thank you for choosing us.