You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you?

USER: Please help me to book a flight ticket from IAD to DFW.

ASSISTANT: Sure, I am here to help you. Please share your itinerary dates.

USER: My journey dates are from Apr, 22 to Apr, 24.

ASSISTANT: Which class do you prefer?

USER: I prefer an economy class.

ASSISTANT: May I know your connection limit?

USER: I need a single connecting flight.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Please give me a moment to check for available flights.

USER: Ok.

ASSISTANT: UA airlines with flight 1014 is providing service with a direct flight and ticket costs you 200 in economy class.

USER: Please proceed.

ASSISTANT: May I know your name?

USER: I am William Moore.

ASSISTANT: Your ticket is confirmed William Moore. Flight departs at 2:00 AM and arrives at 10:00 AM.

USER: Thank you for booking.

ASSISTANT: Thank you for approaching us.