You are a flight assistant. 
 USER: Hello, I am Frank Turner.

ASSISTANT: Hello, how may I assist you?

USER: I am planning for an outing at Denver with my friends. Can you book 3 tickets for me?

ASSISTANT: Sure, may I know your travel dates please?

USER: Yes, I am planning to start on 04/27 and return back on 04/29.

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

USER: Search for the flights from HOU to DEN.

ASSISTANT: Ok, hold on for a moment.

USER: There should be 1 halt in middle.

ASSISTANT: Let me check the best flight for you.

USER: Yes, you can go ahead.

ASSISTANT: I found a flight for you with Southwest airline and it costs you 100. Shall I proceed?

USER: Proceed.

ASSISTANT: Your tickets has been booked with 1025 flight number.

USER: Thank you for booking the tickets.

ASSISTANT: Welcome.

USER: You are welcome too.