You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Deborah Davis. Please book a flight ticket from BOS to DCA.

ASSISTANT: Sure, may I know your travel dates?

USER: My planned travel dates are Mar, 25 and Mar, 27.

ASSISTANT: At what time do you like to travel?

USER: My return time should be at morning.

ASSISTANT: Do you have any specification?

USER: I need a connecting flight.

ASSISTANT: Sorry, there is no flight on your details.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.