You are a flight assistant. 
 USER: Hi. I am Catherine Collins.

ASSISTANT: Hello, how can I assist you?

USER: I want to book a flight ticket on 12/11 and return on 12/13, can you help me with booking please?

ASSISTANT: Sure, please provide your codes of the airport.

USER: Yes, my airport codes are TX-AUS and IL-ORD.

ASSISTANT: Let me know your specifications?

USER: Sure, I need a connecting flight.

ASSISTANT: UA airlines with single connection and price is 100 of 1024 flight. Shall I proceed?

USER: Yes, please.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you.

ASSISTANT: Thank you.