You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Ryan Collins.

ASSISTANT: How can I assist you?

USER: Could you please help me to book an economy class ticket within the fare limit 5000 to Dallas?

ASSISTANT: Ok, may I know the travel dates to book?

USER: I would like to start on 01/18 and my return date will be on 01/20.

ASSISTANT: May I know the airport codes to book?

USER: I want to start from Phoenix, AZ-PHX to reach Dallas, TX-DFW.

ASSISTANT: There is a flight ticket available with 1 connection limit and the airlines is AA. Can I book the flight 1017?

USER: Yes, you can book the ticket.

ASSISTANT: Ok, the flight ticket is booked and the airfare is 100.

USER: Thank you for your kind service in booking.

ASSISTANT: Thank you for choosing our agency.