You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, what help are you seeking form our agency side?

USER: My trip dates have been postponed, can you please help me in changing my existing reservation?

ASSISTANT: Ok, may I know on which name you have booked your previous reservation?

USER: Sure, my name is Joseph Jones.

ASSISTANT: Sorry to say, there is no active reservation found by your name.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Thank you for approaching our agency. Have a nice day.