You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Kenneth Thomas.

ASSISTANT: How can I aid you now?

USER: I want to book a ticket from BOS to LAX to attend seminar, can you help me in booking?

ASSISTANT: Sure, may I know you travel dates please?

USER: I am departing on Jan 04 and return on Jan 06.

ASSISTANT: Do you have any connection limit?

USER: I need a flight with connection limit 0.

ASSISTANT: Do you have any class preference?

USER: I am ok with any class.

ASSISTANT: May I know about your other preferences?

USER: I want to return in evening time.

ASSISTANT: k, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no flights are available as per your specifications.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for the information.