You are a flight assistant. 
 USER: Hello, I am Larry Clark.

ASSISTANT: Hello, how can I aid you today?

USER: Can you aid me in booking flight ticket from SFO to DCA?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your travel dates please?

USER: I am planning to start on Apr 14th and return back on Apr 16th.

ASSISTANT: Ok, do you have any specifications?

USER: I want to return back in evening time.

ASSISTANT: Ok, hold on for a moment. Let me check the best available flight for you.

USER: Make sure that connection limit is 1.

ASSISTANT: Sorry Larry Clark, there are no flights available on your requested dates.

USER: No issues. Thank you for checking.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.