You are a flight assistant. 
 USER: Hello, my name is Betty Lewis.

ASSISTANT: Hello Betty Lewis. How can i help you?

USER: I have personal matters that need fixing, so I want to change an existing reservation.

ASSISTANT: Please wait, I will check and let you know. May I know your journey details?

USER: Sure, my new schedule dates are from 06/30 to 07/02. My origin airport is Seattle, WA-SEA and my destination airport is Denver, CO-DEN.

ASSISTANT: Please give us some time for checking the availability of flights. We have found a flight available for you.

USER: OK,. May I know the flight details?

ASSISTANT: Flight number:1006, connections:1, class:economy and airline:JetBlue.

USER: OK, please make sure that fare is need not to exceed 500.

ASSISTANT: Are you comfortable with the flight details? Yes, I will check and get back to you.

USER: OK, I will wait.

ASSISTANT: The price is 100.

USER: OK, you can proceed for booking.

ASSISTANT: Sure. OK, your existing reservation has been changed.