You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you now?

USER: My exam has been postponed, so I want to reschedule my itinerary dates.

ASSISTANT: Sure, I will help you with that. May I know your good name please?

USER: John Brown here.

ASSISTANT: Please wait for a moment, while I check for the reservation.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry there is no reservation found on your name in our system data.

USER: No problem, thank you.

ASSISTANT: Thank you for visiting us, we hope see you again.