You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Joseph Hill here.

ASSISTANT: How may I assist you?

USER: I would like to meet my college friend at Dallas, please help me in booking a ticket from IAD to DFW.

ASSISTANT: Sure, I am here to help you with that. May I know your travelling dates please?

USER: My planned journey dates are on June 05 and June 07.

ASSISTANT: please share if you want to travel in any specific time?

USER: I would like to depart in the morning time.

ASSISTANT: Do you prefer either business or economy class?

USER: I prefer economy class for this trip.

ASSISTANT: Can you please share your connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you have any other specifications?

USER: I prefer normal cost airline.

ASSISTANT: Wait a moment please.

USER: Sure, take your time.

ASSISTANT: Joseph Hill, there are no flights available in your route.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.