You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am planning to visit Empire State Building, which is located at New York.Can you please book a flight ticket from Washington?

ASSISTANT: Sure, can you please provide me your itinerary travel dates?

USER: My itinerary travel dates are June 13th and June 15th.

ASSISTANT: Would you let us know the genesis and terminus airport codes?

USER: My airport codes are from DCA to EWR.

ASSISTANT: May I know your preferable connection limit?

USER: I need a direct flight.

ASSISTANT: Is there any time concern?

USER: No.

ASSISTANT: Are there any more preferences that you want to avail?

USER: No.

ASSISTANT: May I ask you for your name?

USER: Kenneth Mitchell.

ASSISTANT: Kenneth Mitchell. Can you spare me a moment?

USER: Sure.

ASSISTANT: I really regret to inform that there are no flights on your route with the given dates.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: Thank you.