You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Can you please help me in booking my flight ticket from OAK to SEA?

ASSISTANT: Sure, I will help you. Please help me with your planned travel dates.

USER: My planned trip dates are June 29 to July 01.

ASSISTANT: May I know with your name please?

USER: My name is Mary Campbell.

ASSISTANT: Do you need a break in you journey?

USER: Yes, I need a connecting flight.

ASSISTANT:  Please help me with your preferred class to fly. Do you have any other preferences in your journey?

USER: I need to fly in business class. No.

ASSISTANT: Mary Campbell, I am really sorry to inform you that there are no active flights available for your journey.

USER: Ok, no issues. Thank you for your service.

ASSISTANT: Thank you for contacting us. Have a great time.