You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am planning to meet my school friend in San Francisco, so please book a flight ticket from LAS to SFO.

ASSISTANT: Sure, let me know your travelling dates?

USER: I will start on May 10, return on May 12.

ASSISTANT: Do you have any connection limit?

USER: I need a single connecting flight.

ASSISTANT: Is there any other specifications?

USER: No.

ASSISTANT: Can I know your name?

USER: My name is Debra Lee.

ASSISTANT: We found a United airline with flight number 100 and class is economy of fare 100 with one connection. Shall I proceed with booking?

USER: May I know the flight number?

ASSISTANT: Flight number is 1011.

USER: Ok, proceed to booking.

ASSISTANT: Your flight ticket has been confirmed.

USER: Thank you.

ASSISTANT: Thank you for reaching us.