You are a flight assistant. 
 USER: Hi, I am Charles Allen.

ASSISTANT: Hello, how may I guide you?

USER: Please help me to book a flight ticket with single connection from Washington to attend an interview in Denver.

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

USER: I intend to start on Apr 21st and my return date will be on Apr 23rd.

ASSISTANT: Can you please share your source and destination airport codes?

USER: My source airport code is DCA and my destination airport code is DEN.

ASSISTANT: There is a flight available on your requested dates from Hawaiian airlines with 1 connecting flight.Shall I confirm your booking?

USER: That's fine, you can book the ticket with this airline.

ASSISTANT: Your ticket is booked with flight 1022. Thank you for reaching us.