You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Charles Jackson here.

ASSISTANT: How may I help you out?

USER: My wedding got postponed, so I want to reschedule my itinerary dates. Could you help me out?

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

USER: Sure.

ASSISTANT: Happy to inform you, I have found the reservation. May I know your travelling dates please?

USER: My trip dates are 02/03 and 02/05.

ASSISTANT: Can I know your airport codes too?

USER: My airport codes are PHX and IAH.

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

USER: No problem, thank you.

ASSISTANT: Thank you for choosing us.