You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you at this moment?

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

ASSISTANT: Sure I will help you with that. Can I know your name to check your previous reservation status?

USER: Sure, my name is Katherine Taylor.

ASSISTANT: Please wait a moment.

USER: Sure, I'll wait for your response.

ASSISTANT: We regret to inform you that there is no reservation found on your name in our records.

USER: Oh! That's ok, may be I have done a wrong booking. Thank you anyways.

ASSISTANT: Thank you for reaching us, have a great day.