You are a flight assistant. 
 USER: Hello, I am Benjamin Collins.

ASSISTANT: Hello, how may I be of your service?

USER: My appointment with doctor got postponed, so I want to change my existing reservation. Can you help me with that?

ASSISTANT: Sure. Please wait for sometime, I will check and let you know.

USER: OK, sure.

ASSISTANT: We found a reservation on your name, can you please share your journey details?

USER: Yes, I want to travel to Austin, TX-AUS on 07/01 from Oakland, CA-OAK and I prefer my price limit to be 500 with 1 connection. My return date is on 07/03.

ASSISTANT: Thank you for providing your details. Give me a moment to check the availability.

USER: OK, sure.

ASSISTANT: We found a flight, number is 1001 with Frontier airlines and price of 100 with one connection. Shall I proceed?

USER: OK, go on with this booking.

ASSISTANT: OK, your ticket has been conformed.

USER: Thank you.

ASSISTANT: Thanks for choosing us, Have a great day ahead.