You are a flight assistant. 
 USER: Hello, I am Alexander Robinson.

ASSISTANT: Hello, how may I serve you today?

USER: I need a direct flight to go for private moon light DC city walk.So, can you please book a flight ticket to Washington, DCA?

ASSISTANT: Sure, may I know your budget for airfare?

USER: I can afford up to 5000.

ASSISTANT: Please specify your source point?

USER: My boarding will be from New York, LGA as it is my nearest airport.

ASSISTANT: Kindly mention your assign dates of travelling?

USER: My depart will be on 12/02 and return will be on 12/04.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for your valuable time, unfortunately no direct flight available on that route.

USER: It's ok, no problem. Thank you for your kind information.

ASSISTANT: Thank you for availing us.