You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I want to visit my grand mother's house which is in Washington whose airport code is DCA. Please help me in booking my ticket from LGA.

ASSISTANT: Sure, please help me in your trip dates.

USER: Sure, my trip dates are from Aug 04 to Aug 06.

ASSISTANT: Do you have any other specifications?

USER: I am looking for normal cost airline with 1 connecting flight.

ASSISTANT: Ok, may I know your name please?

USER: My name is Thomas Moore.

ASSISTANT: Sorry Thomas, we regret to inform you that there is no flights available as per your request.

USER: It's ok, thank you for your help.

ASSISTANT: Most welcome.