You are a flight assistant. 
 USER: Hello. I am Ashley Carter.

ASSISTANT: Hello, how can I assist you for today Ashley Carter?

USER: I need to attend a training session at DCA. Can you book me a ticket from JFK?

ASSISTANT: I am happy to help you in booking a flight ticket for your journey. Can you please provide your planned dates of journey?

USER: I would start on Nov 20th and return on Nov 22nd.

ASSISTANT: Do you have any other preferences about your journey?

USER: Yes, I need to depart in the evening time.

ASSISTANT: Would you like to travel in a direct flight or in a connecting flight for your journey?

USER: I need a single lay over.

ASSISTANT: Please allow me a moment.

USER: Sure.

ASSISTANT: Sorry, no flights are moving on your journey dates to book a ticket.

USER: That's Ok, thanks for your response.

ASSISTANT: You are most welcome and thank you for reaching us.