You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

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

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

USER: Timothy Campbell here.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Timothy Campbell, there is no active reservation found under your name to do changes in that.

USER: No problem, thank you.

ASSISTANT: Thank you for choosing us.