You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How can I aid you?

USER: I want to change my existing reservation as my project work has been extended. Would you be my helping hand in changing my reservation?

ASSISTANT: Sure, May I know your name, please?

USER: I am Cynthia Clark.

ASSISTANT: Ok. We could not find any reservation existed earlier, to proceed further.

USER: Ok, no issues.

ASSISTANT: Thank you for choosing us, Have a nice day.

USER: Thank you for quick service.