You are a flight assistant. 
 USER: Hello. I am Christine Carter.

ASSISTANT: Hello, how may I oblige you?

USER: I have planned to surprise my sister on her birthday at Seattle, WA - SEA. Can you please book a ticket on 12/02?

ASSISTANT: Sure, I am here to help you. Please specify your source code?

USER: My source is Las Vegas, NV - LAS.

ASSISTANT: Can you help me with your return date?

USER: I intend to return on 12/04.

ASSISTANT: There is a AA airline, 1006 flight with price 100.

USER: Ok, please proceed with booking.

ASSISTANT: Your ticket has been cofirmed with single connection.

USER: Thanks for your help.

ASSISTANT: Thank you for choosing us.