You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: Can you please book a flight ticket from DTW to DCA?

ASSISTANT: May I know your travelling dates?

USER: My travelling dates are July 17th and July 19th.

ASSISTANT: Is there any class preference?

USER: I prefer to travel in an economy class.

ASSISTANT: May I know your connection limit?

USER: I need a direct flight.

ASSISTANT: May I know your name?

USER: Dorothy Perez.

ASSISTANT: Sorry, there are no flights found on your travel dates.

USER: Ok, thank you.

ASSISTANT: Thank you for reaching us.