You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Can you help me to book a flight from SFO to DEN?

ASSISTANT: Sure, may I know your trip dates?

USER: My travelling dates are Sept 17 and 19.

ASSISTANT: Let me know your connection limit.

USER: I prefer connecting flight to travel.

ASSISTANT: May I know your name?

USER: My name is Andrew Campbell.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: We found an Frontier airline with single connection and flight number is 1020.

USER: Proceed with booking.

ASSISTANT: Your ticket has been confirmed with economy class.

USER: Thank you.

ASSISTANT: Thank you for choosing us.