You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Kevin Clark.

ASSISTANT: Kevin Clark, how may I assist you today?

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

ASSISTANT: Sure, I will help you. Please help me with your planned travel dates.

USER: I am departing on Oct 31 and return on Nov 02.

ASSISTANT: Please help me with your depart and return time.

USER: I want to return in evening time.

ASSISTANT: Do you have any other preferences in your journey?

USER: I want a flight with connection limit 1.

ASSISTANT: Kevin Clark, I am really sorry to inform you that there are no flights available for your journey.

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

ASSISTANT: Thank you for reaching us. Have a great time.