You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Paul Thomas here.

ASSISTANT: How may I help you out?

USER: My client meeting got postponed, so I want to reschedule my itinerary dates.

ASSISTANT: Sure, I will help you in changing the reservation.

USER: Ok.

ASSISTANT: Sorry, there are no reservations found.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for your services.