You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you now?

USER: I am Brandon Wilson. I want to book a flight ticket from LGA to DCA. Could you help me in booking?

ASSISTANT: May I know your travelling dates?

USER: My travelling dates are from June 07-09.

ASSISTANT: Brandon Wilson, do you need a connecting flight?

USER: Yes.

ASSISTANT: May I know your depart and return time?

USER: My depart time should be in the evening.

ASSISTANT: Do you have any class preferences?

USER: No.

ASSISTANT: May I know your airline preference too?

USER: I am comfort with any airline.

ASSISTANT: Sorry to tell you, there is no flight available on your request.

USER: That's ok, no problem.

ASSISTANT: Thank you for choosing our airlines.

USER: Thank you.

ASSISTANT: Most welcome.