You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Carol Anderson, I want to book a flight to Oakland to meet my sister. Can you book a connecting flight for me?

ASSISTANT: Sure, can I know your travelling dates?

USER: I will travel on Feb 2 and return on Feb 4.

ASSISTANT: Ok, please let me know your source airport codes?

USER: My source point is PHL.

ASSISTANT: Do you have any particular time for departing and returning?

USER: I want my return flight in afternoon.

ASSISTANT: Which class do you prefer?

USER: I am fine with any class.

ASSISTANT: Would you like to prefer direct flight or connecting flight?

USER: I need a connecting flight.

ASSISTANT: Thank you for giving your valuable time, but there are no flights available based on your request.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for opting us, we hope to serve you again with better features.