You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

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

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

USER: Dennis Johnson here.

ASSISTANT: Sorry, there are no reservations found in our database.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.