You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am planning to attend music concert at DCA, can you please help me with booking a flight ticket from BOS?

ASSISTANT: May I know your travel dates?

USER: I would like to take off on Oct 11 and return on Oct 13.

ASSISTANT: Do you have any connecting preferences?

USER: I am looking for a connecting flight.

ASSISTANT: May I know your name please?

USER: My name is Larry Collins.

ASSISTANT: Is there any other Concern?

USER: I don't have any other preference.

ASSISTANT: Sorry, no flights found as per your request on this route at the moment.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for choosing us.

USER: You are welcome.