You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: Please help me out in booking the ticket from DEN in the evening.

ASSISTANT: Sure, may I know your travelling dates?

USER: My trip dates will be July 21 to July 23.

ASSISTANT: Can I know your name?

USER: Paul Jackson is my name.

ASSISTANT: Let me know your connection limit?

USER: I need a connecting flight.

ASSISTANT: May I know your destination airport code?

USER: My return airport code is IAD in economy class.

ASSISTANT: There is a connecting flight 1003 of Delta airlines, can I proceed?

USER: Please proceed.

ASSISTANT: Your booking is done.

USER: Thank you.

ASSISTANT: Welcome.