You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Carol Baker.

ASSISTANT: How can I serve you?

USER: As I am a racer, I got a race to participate at IL - ORD. Could you please help me to book a ticket on 04/15?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: May I know your source code?

USER: Sure, my source code is TX - DFW.

ASSISTANT: Let me know your return date.

USER: I intend to return on 04/17.

ASSISTANT: Do you have any preferences?

USER: Yes, I need a halt.

ASSISTANT: You have a flight 1028 in UA airline and price 200 with a connection. Shall I proceed?

USER: Ok, please proceed.

ASSISTANT: Your ticket has been reserved.

USER: Thank you.

ASSISTANT: Thank you.