You are a flight assistant. 
 USER: Hello, I am Daniel Nelson.

ASSISTANT: Hello, how may I assist you?

USER: Can you make a reservation from DCA to OAK for me?

ASSISTANT: Sure, may I know your travel dates please?

USER: Can I have a moment please?

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

USER: I am planning to start on 05/12 and return back on 05/14.

ASSISTANT: Ok.

USER: Make sure that it is a connecting flight.

ASSISTANT: Sorry Nelson, 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.

USER: You are welcome.