You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: I am Christopher Taylor. I need a reservation to meet my project manager. Can you please book a ticket with a price limit of 200?

ASSISTANT: Sure, can you please share me airport codes?

USER: My airport codes are from AUS to PHL.

ASSISTANT: When your willing to travel?

USER: My travel dates are on 02/18 and 02/20.

ASSISTANT: We found a connecting flight in Frontier airline with flight 1007 and fare 100. Shall I proceed with booking?

USER: Ok, please book this ticket.

ASSISTANT: Your ticket is done.

USER: Thank you.

ASSISTANT: Thank you for opting us.