You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sharon Lopez.

ASSISTANT: How can I assist you?

USER: I planned to attend for a meeting in MSP, can you please help me to book a flight ticket from DCA?

ASSISTANT: Sure, can I know the travel dates please?

USER: I prefer to travel on Jun 6 and Jun 8.

ASSISTANT: Do you have any requirements?

USER: I would like to depart in evening in a connecting flight.

ASSISTANT: Do you have any airline preferences?

USER: No.

ASSISTANT: Ok, wait a moment please.

USER: Sure.

ASSISTANT: Sorry, there are no flight available as per your request.

USER: Ok, no problem.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your time.