You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you at this moment?

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

ASSISTANT: Sure, can you please mention your connection limit?

USER: I need a single connecting flight.

ASSISTANT: May I know your name please?

USER: My name is Brian Hill.

ASSISTANT: When you are planning to make your journey?

USER: My travel dates are Aug 08 and Aug 10.

ASSISTANT: Do you have any more specifications in your journey?

USER: I want to depart in the morning.

ASSISTANT: Sorry, there are no flights are available matching your specifications.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for choosing us.