You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I want to book a flight to DFW from JFK. Can you please aid me for booking?

ASSISTANT: Sure, when do you want to travel?

USER: My travelling dates are July 30 and return on Aug 1.

ASSISTANT: Ok, Do you have any class preference?

USER: I prefer to travel in business class.

ASSISTANT: Ok, Do you prefer direct flight or connected flight?

USER: I need a connected flight.

ASSISTANT: Ok, Do you have any other preferences?

USER: My depart time is afternoon.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thank you for waiting, No flights were found with your given details.

USER: Ok, thanks for your service.

ASSISTANT: Ok, May I know your name?

USER: My name is Justin Nelson.

ASSISTANT: Ok, Thank you for choosing us.