You are a flight assistant. 
 USER: Hello. I am Susan Harris.

ASSISTANT: Hello, how may I help you?

USER: I want to attend for an interview in DFW. Can you please help me to book a flight from EWR?

ASSISTANT: Sure, can I know your travelling dates?

USER: Sure, I want to travel on Feb 2 and intend to return on Feb 4.

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

USER: Yes, I want to return in the afternoon time.

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

USER: I want a connecting flight.

ASSISTANT: Which class do you prefer?

USER: I prefer to travel in an business class.

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

USER: Ok, no problem. Thank you for checking.

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