You are a flight assistant. 
 USER: Hello. I am Anna Campbell.

ASSISTANT: Hello, how can I aid you today?

USER: I want to book a flight ticket from Austin AUS to Oakland OAK. Can you make a reservation for me?

ASSISTANT: Sure, when are you planning to start and return on?

USER: Ok, my planned trip dates are on Apr 16 and return on Apr 18.

ASSISTANT: Do you need a connecting flight?

USER: Yes, I need a single connecting flight.

ASSISTANT: Can I know your depart and return timing?

USER: Yes, I want to depart in the morning time.

ASSISTANT: Is there any class preferences?

USER: Yes, I want a business class.

ASSISTANT: In which airline do you want to travel?

USER: No, I don't have any airline specifications.

ASSISTANT: Thank you for your details, there are no flights with the given details.

USER: Ok, not an problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.