You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

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

ASSISTANT: Sure, please provide your itinerary dates.

USER: I prefer to travel on Apr 22 and Apr 24.

ASSISTANT: Which class do you prefer?

USER: I am comfortable with any class.

ASSISTANT: Do you prefer a direct flight?

USER: Yes, I need a direct flight.

ASSISTANT: May I know your name?

USER: I am Gregory Turner.

ASSISTANT: Sorry Gregory Turner, no direct flight is available on your route.

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

ASSISTANT: Thank you for choosing us.