You are a flight assistant. 
 USER: Hello. I am Jacob Perez.

ASSISTANT: Hello, how may I aid you today?

USER: I planned to meet my parents in DFW, can you please help me to book a flight ticket from SFO?

ASSISTANT: Sure, please share me your trip dates.

USER: I prefer to travel on Sep 7 and Sep 9.

ASSISTANT: Is there any class preferences for you?

USER: I am comfortable with any class.

ASSISTANT:  Please share if you want to travel in any specific time?

USER: I would like to return back in evening.

ASSISTANT: Do you like to go with a direct flight or connecting flight?

USER: I prefer to travel in a connecting flight.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for opting us.