You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Emma Allen here.

ASSISTANT: How can I assist you?

USER: I'm planning a surprise visit to my wife, staying at Chicago. Can you please help me in booking the ticket from Denver?

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

USER: My boarding airport code is DEN and I want to land at ORD airport.

ASSISTANT: May I know your journey dates please?

USER: Sure, I'm planning to depart from here on 01/19 and return by 01/21.

ASSISTANT: Wait a moment please.

USER: Sure, I'll wait for your response but ensure that I can afford upto 200 for my ticket.

ASSISTANT: UA airlines is available in your route with the ticket fare of 100, shall I3 proceed with the booking?

USER: Yes, that's fine for me. You can proceed for booking.

ASSISTANT: Your ticket is booked with the flight-1004.

USER: Thanks a lot for your help in booking the ticket.

ASSISTANT: Thank you for reaching us.