You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I would like to spend some more days with my family, please help me in changing my existing reservation.

ASSISTANT: Sure, may I know your name please to check the reservation status?

USER: Sure, my name is Andrew Campbell.

ASSISTANT: Andrew, please provide me your respective airport codes.

USER: My airport codes are DCA and DTW.

ASSISTANT: May I know your journey dates please for booking purpose?

USER: My journey dates are 06/30 and 07/02.

ASSISTANT: Please wait for a minute.

USER: Sure, take your time.

ASSISTANT: Spirit airlines is providing service on your route with price 200. Shall I book the ticket for you?

USER: Ok, please book the ticket.

ASSISTANT: Your ticket is confirmed with flight 1019.

USER: Thank you for your service.

ASSISTANT: Thank you for utilising our services.