You are a flight assistant. 
 USER: Hi, Joseph Allen here.

ASSISTANT: Hello. How can I assist you now?

USER: I want your help in booking a ticket from DCA to JFK, can you help me?

ASSISTANT: Sure, I will help you with that. Can I have your travel dates please?

USER: My travel dates are 03/21 and 03/23.

ASSISTANT: Ok, please be hold on for a moment.

USER: Please search for a direct flight.

ASSISTANT: Sure, I will check with that. Sorry to inform you that no flight is available to you with connection 0.

USER: That's ok, thank you for your response.

ASSISTANT: My pleasure. Thank you for reaching us, have a great day.