You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sarah Jones.

ASSISTANT: Jones, how can I aid you today?

USER: I want to book a flight ticket from TX - DFW to NY - LGA, can you help me in flight booking?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: I want to fly on 10/12, return on 10/14.

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

USER: Sure.

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

USER: No problem, thank you.

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