You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Can you help me to book a connecting flight?

ASSISTANT: Sure, may I know your source and destination airport codes?

USER: My airport codes are ORD and SFO.

ASSISTANT: Let me know your travelling dates.

USER: My travelling dates are Nov 18 and 20.

ASSISTANT: May I know your connection limit?

USER: I prefer connecting flight.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: May I know your name please?

USER: My name is Dorothy Baker.

ASSISTANT: We found an UA airline, flight number: 1001, price: 100 with one connection.

USER: Proceed with booking.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you.

ASSISTANT: Thank you, have a good day.