You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I need your help in booking a flight ticket from PHL to OAK.

ASSISTANT: Sure, please share me your trip dates.

USER: August 5 and 7 are my planned travelling dates.

ASSISTANT:  For booking, we need your good name. Please mention it.

USER: Sure, my name is Donald White.

ASSISTANT:  Do you need direct flight or connecting flight?

USER: I would prefer to fly in a connecting flight.

ASSISTANT: May I know your class preferences?

USER: I am good with any class of flight.

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

USER: That's ok. Thank you.

ASSISTANT: Thank you for opting us.