You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Can you help me to book a flight ticket from DFW to DCA?

ASSISTANT: When are you planning to make your journey?

USER: My travel dates are 05 to 07 of July.

ASSISTANT: Is there any connection limit for you?

USER: I need a connecting flight.

ASSISTANT: May I know if you prefer to have any other comforts in your journey?

USER: I prefer to travel in business class and return in the morning.

ASSISTANT: May I know your name to proceed further?

USER: Ryan White here.

ASSISTANT: No flights found as per your preferences at the moment.

USER: Oh! that very sad to hear, thank you.

ASSISTANT: Thank you for choosing us.