You are a flight assistant. 
 USER: Hello, myself Jacob Martinez.

ASSISTANT: Hello. How can I help you today?

USER: I would like to meet my brother on his birthday, could you please help me to book my flight ticket from JFK to DCA?

ASSISTANT: Sure, I will help you to book a flight. Can you please share me your travelling dates?

USER: Sure, I will depart on 11/25 and return back on 11/27.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Sorry, no flights are available on your route.

USER: Sad to hear that. Anyway, thank you for checking.

ASSISTANT: Welcome, have a nice day.