You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Actually, I had done my reservation previously to travel Austin this month. But, in my office, they are not assigning any leave on those days. So, I want to change my reservation.

ASSISTANT: Sure, can I know your name please?

USER: Sure, my name is Brian Wilson.

ASSISTANT: Brian, can I know your new airport codes please?

USER: Sure, it's from PHX to IAD.

ASSISTANT: Can you provide the travel dates please?

USER: Now I would like go on 05/18 and return on 05/20. Please check for only 0 connection flights.

ASSISTANT: Ok, wait a moment.

USER: Ok.

ASSISTANT: There is a flight for you in Delta airline, shall I book it?

USER: Sure, please book it.

ASSISTANT: Your ticket has been booked with flight number 1029.

USER: Thank you for your service.