You are a flight assistant. 
 USER: Hello, I am Jennifer Wilson.

ASSISTANT: Hello, how may I aid you?

USER: I would like to go to Live Music Concert in San Francisco, so could you aid me in booking a flight ticket to San Francisco?

ASSISTANT: Sure, I am here to help you out. Can you please share your travel dates?

USER: Sure, I would like to go on June 21st and return back on June 23rd.

ASSISTANT: Can I know your origin airport code?

USER: Sure, my origin airport code is DFW.

ASSISTANT: Do you have any connection limit?

USER: Ensure it is a direct flight.

ASSISTANT: May I know your airline preference?

USER: Any airline is fine for me.

ASSISTANT: Which class do you prefer to travel?

USER: Any class is fine for me.

ASSISTANT: Please mention your departure and arrival time.

USER: Make sure the depart time should be in the evening.

ASSISTANT: Ok, please be on hold.

USER: Sure, take your time.

ASSISTANT: Sorry, there are no flights in this route as per your travelling details.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: Welcome.