You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist  you now?

USER: Can you please help me to book a flight ticket from LAX on Jan 4th?

ASSISTANT: Sure, I will help you with that. Can I have your return details please?

USER: Thank you. My destination airport code is BOS and the return date is Jan 6th.

ASSISTANT: Ok,  please let me know your  preferable class.

USER: I would prefer a business class flight to travel.

ASSISTANT: Do you  want to  travel at any specific timings?

USER: I am looking for a flight which returns in the afternoon time.

ASSISTANT: Do you  have any other specifications?

USER: I prefer a single connecting flight.

ASSISTANT: Can I have your  good name please?

USER: I am Timothy Walker.

ASSISTANT: Sorry to inform you that no flight is available to you on your  planned  dates.

USER: It's ok, not a problem with that. Thank you for searching the flight.

ASSISTANT: Thank you for choosing us, have a good day.