You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

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

ASSISTANT: Please provide your travelling dates.

USER: My trip dates are May 03 and May 05.

ASSISTANT: Is there any preference?

USER: I need a connecting flight.

ASSISTANT: May I know your name?

USER: I am Ruth Young.

ASSISTANT: Sorry, there is no flight with your travelling dates.

USER: No problem, thank you.

ASSISTANT: Thank you.