You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Can you please help me to book a ticket from LAX to ORD?

ASSISTANT: Sure, please share me your trip dates.

USER: My trip dates will be on July 19 to July 21.

ASSISTANT: Is there any class preferences for you?

USER: No.

ASSISTANT: Do you need any preferences?

USER: I need a direct flight.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: May I know your good name?

USER: Paul Wright here.

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

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for opting us.