You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Timothy Campbell. I am looking for a flight from BOS to OAK, can you help me out in booking the flight ticket?

ASSISTANT: Sure, can I know your travelling dates?

USER: My trip dates are from Oct 18th tilll Oct 29th.

ASSISTANT: Please check with the return date?

USER: I need my return flight in afternoon session.

ASSISTANT: Ok.

USER: Sorry, my return date is on Oct 20th.

ASSISTANT: Which class do you prefer?

USER: No, I need a direct flight.

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

USER: That's ok, not an issue. Thank you for your help.

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