You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Nancy Roberts here.

ASSISTANT: How can I aid you today?

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

ASSISTANT: Sure, I am here to help you with that.

USER: Ok.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: Sorry to say that, there is no reservation found on your name.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for reaching us.