You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you for the day?

USER: Owing to an emergency, my live concert got postponed. So I want you to change my existing reservation.

ASSISTANT: Sure, I will help you with that reservation change. May I know your name for further process?

USER: Sure, Barbara Walker here.

ASSISTANT: I have found your previous reservation with your name. Can you please mention your preferable airport codes?

USER: Sure, I need to deviate from JFK to MSP.

ASSISTANT: May I know your new travelling dates, please?

USER: My journey dates are Aug 1 and Aug 3.

ASSISTANT: Do you have any other specifications?

USER: I need a halt.

ASSISTANT: According to your details, I have found a flight in AA airline with a fare of 100. Shall I proceed?

USER: Yes, you can.

ASSISTANT: Your booking is confirmed with the flight-1006.

USER: Thank you for your assistance.

ASSISTANT: Thank you for reaching us, have a safe journey.