You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

USER: Ryan Parker here. I need to cancel my recent reservation because my trip dates are postponed, can you help me?

ASSISTANT: Sure, I will aid you. Please wait for a moment.

USER: Sure, take your own time.

ASSISTANT: Sorry Ryan Parker, there is no reservation done on your name.

USER: That's ok, thank you for checking.

ASSISTANT: You are welcome, thank you for reaching us. Have a nice day.