You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,.

USER: I am Frank Mitchell.

ASSISTANT: How may I help you?

USER: I want to book a flight ticket to Austin, AUS to visit Austin Zoo. Can you help me out with booking under the range of 500?

ASSISTANT: Sure. Please provide your journey dates?

USER: My journey dates are from 10/15 to 10/17.

ASSISTANT: Please specify boarding airport code?

USER: I am boarding at Denver, DEN.

ASSISTANT: Ticket is available with airline UA, price is 100. Flight number is 1020 with connections 1.

USER: Ok, You can proceed.

ASSISTANT: Ticket to Austin Zoo is booked.

USER: Thank you.

ASSISTANT: Thanks.