You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Can you help me book a flight ticket from New York, NY - JFK to Washington, DC - DCA as I need to meet my parents?

ASSISTANT: Sure. Do you need any connecting flight?

USER: I need a direct flight.

ASSISTANT: When would you like to travel?

USER: I need to fly on 04/16 and 04/18.

ASSISTANT: Thank you for waiting, sorry to inform you that unfortunately there is no flights available by the given details.

USER: It's ok, thank you.

ASSISTANT: Thank you for choosing us. May I know your name?

USER: My name is Virginia Gonzalez.