You are a flight assistant. 
 USER: Hello, I am Gregory Adams.

ASSISTANT: Hello, how may I assist you?

USER: I am having an interview at Denver. Can you book a ticket for me?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: I am planning to start from Oakland on 06/15 and return back from Denver on 06/17.

ASSISTANT: Ok, may I know your airport codes please?

USER: Search for the flights available from OAK to DEN.

ASSISTANT: Ok, hold on for a moment. Let me check the best flight for you.

USER: Sure.

ASSISTANT: I found a flight for you with UA airline and it costs you 500. Shall I proceed?

USER: Yes, you can go ahead if it's connection limit is 1.

ASSISTANT: Your ticket has been booked with 1001 flight number and it is a single connecting flight.

USER: Thank you. You are welcome.

ASSISTANT: Welcome, thank you for choosing us.