You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Jacob Anderson here. I would like to change my recent reservation because my brother marriage is cancelled.

ASSISTANT: Sure, I will help you with that.

USER: Thank you for positive response.

ASSISTANT: Please give me a moment to check your previous reservation.

USER: Sure, take your own time.

ASSISTANT: Anderson, we found your reservation, can you please mention your airport codes?

USER: My travelling airport codes are DFW to CLT.

ASSISTANT: OK, let me know your travel dates to proceed further.

USER: My trip dates are 10/20 and 10/22.

ASSISTANT: Spirit airlines is having a connecting flight with a fare of 200, shall I book that flight?

USER: Sure, proceed with booking.

ASSISTANT: Your ticket has been booked with the flight-1017.

USER: Thank you for helping me.

ASSISTANT: Welcome, have a safe journey.