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, May I know your name?

USER: Barbara White here.

ASSISTANT: Please wait a second.

USER: Sure.

ASSISTANT: Sorry, No reservation found on your name.

USER: No problem, thank you.

ASSISTANT: Thank you for availing us.