You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am planning to attend a Crash Course in LGA, so please help me in booking a flight ticket from DCA.

ASSISTANT: Sure, can you please share your travel dates?

USER: I would like to fly on Aug 09 and return on Aug 11.

ASSISTANT: May I know your connection limit?

USER: I need a single connection.

ASSISTANT: Do you have any other specification that you are looking for?

USER: I would like to return in the evening time.

ASSISTANT: May I know your name to proceed further?

USER: Myself Linda Clark.

ASSISTANT: I am sorry to inform you that there is no flight available at your request.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for contacting us.