You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

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

ASSISTANT: Sure, let me check your reservation status.

USER: Sure, take your own time.

ASSISTANT: Sorry, I have not found any reservation under your name in our database.

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

ASSISTANT: You are welcome and thank you for choosing us.