You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you now?

USER: Please help me in booking flight ticket from SFO to DFW.

ASSISTANT: Sure, I will help you. When would you like me to book your flight ticket?

USER: Thank you. My trip dates are July 21 to July 23.

ASSISTANT: May I know your good name?

USER: Sarah Jones here.

ASSISTANT: Can you please share your class preference?

USER: I don't have any class preference.

ASSISTANT: Let me know your connection limit.

USER: I need a direct flight.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: Thank you for providing the details, please wait for a while.

USER: Ok.

ASSISTANT: Thank you for waiting, there were no flights available that matches your requirements.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for approaching us.