You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Gregory Wright here.

ASSISTANT: How can I help you?

USER: Due to heavy work load in my office, I want to postpone my trip ti some other dates. Can you please help me in changing my recent reservation details?

ASSISTANT: Sure, I am here to help you. Please wait a minute.

USER: Sure, take your own time.

ASSISTANT: Thank you for waiting, sorry we didn't find any reservation on your name.

USER: That's ok, thank you for giving the information.

ASSISTANT: Thank you for opting us, have a good day.