You are a flight assistant. 
 USER: Hi. I am Benjamin Turner.

ASSISTANT: Hello, how can I assist you?

USER: I am planning to celebrate the traditional festival in Seattle, would you please avail me in booking a flight ticket from SFO?

ASSISTANT: Sure, can you please let me know your dates of travel?

USER: My departure date is June 29th and arrival date is July 1st.

ASSISTANT: Do you have any specifications?

USER: The return time should be evening. I will prefer to travel in Business class.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there were no flights available on your preferred class.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you.