You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Rebecca Johnson. I want to meet my boss at Los Angeles, can you please help me to book my flight ticket from ATL to LAX?

ASSISTANT: Sure, can I know your travelling dates?

USER: I would like to depart on Dec 25th and I want to return back on Dec 27th.

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

USER: Yes, I prefer to depart in the afternoon.

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

USER: I need single connection flight.

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

USER: Not an issue. Thank you for checking.

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