You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Richard Lopez here.

ASSISTANT: How can I help you?

USER: I am a movie producer, I have to promote my new movie at Los Angeles. Could you book my ticket from Denver?

ASSISTANT: May I know your desired travel dates please?

USER: My itinerary dates are 04/19 and 04/21.

ASSISTANT: Can I know your preferred airport codes please?

USER: I will be travelling from DEN to LAX.

ASSISTANT: There is a flight with connection limit 1 and fare 200, shall I proceed for booking?

USER: Please proceed.

ASSISTANT: Your ticket is booked, flight number 1005 with United airlines.

USER: Thank you.

ASSISTANT: Thank you for choosing us, have a nice day.