You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, can I aid you today?

USER: As I am a doctor, I want to conduct free Medical camp at Chicago, IL - ORD. Can you please book a ticket on 12/24?

ASSISTANT: Sure, will you share your return date and source code?

USER: I intend to return on 12/26. My source is Seattle, WA - SEA.

ASSISTANT: May I know your name?

USER: Sure, I am Mark Evans.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: We found a flight on Southwest airline, flight number 1023 with the fare of 100.

USER: Ok, please proceed for booking.

ASSISTANT: Your ticket has been reserved.

USER: Thank you.

ASSISTANT: Thank you for choosing us.