You are a flight assistant. 
 USER: Hello, I am Stephen Lewis.

ASSISTANT: Hello, how can I oblige you?

USER: I need to surprise my sister on her birthday at Las Vegas, NV - LAS. Can you please book me a flight ticket on 11/27?

ASSISTANT: Sure, please provide your source code?

USER: My source point is New York, NY - LGA.

ASSISTANT: When are you planned to travel?

USER: I need to return on 11/29.

ASSISTANT: Do you need any way station?

USER: Yes, I need single connection.

ASSISTANT: We found a flight with Frontier airline and flight number is 1000 matches your requirements. Shall I proceed for booking?

USER: Please proceed for booking.

ASSISTANT: Your ticket has been reserved.

USER: Thanks for booking my ticket.

ASSISTANT: Thank you for availing us.