You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know your name please?

USER: I am Mark Phillips. I want to book a flight ticket with a single connection, will you help me in booking a flight ticket?

ASSISTANT: Sure, we are here to provide flights as per your request.

USER: Thank you.

ASSISTANT: Please share your travel dates, on which you have planned your journey.

USER: My departure is 10/20 and return date on 10/22.

ASSISTANT: Ok, mention your price limit here?

USER: My price limit is 500.

ASSISTANT: Ok, mention your airport abbreviates here?

USER: I am planning to visit National Building Museum in DC - IAD and origin from TX - DFW.

ASSISTANT: There is a flight in UA airline with number 1004 available for you. Shall I proceed to it?

USER: You can proceed to booking.

ASSISTANT: Ok, your booking has been confirmed successfully.

USER: Thanks for your service.

ASSISTANT: Thanks for reaching us, have a nice day.