You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER:  Can you help me in doing a reservation from EWR to DCA?

ASSISTANT: Sure, please provide your trip dates.

USER: My travel dates are 25 to 27 of June.

ASSISTANT: Do you need any connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you need any other specifications?

USER: I prefer to travel in economy class which depart in the morning.

ASSISTANT: May I know your name?

USER: I am Ronald Martinez.

ASSISTANT: There are no flights available on your routes.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for choosing us.