You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Can you please help me to book a flight ticket from JFK to DEN? I am Ryan Walker.

ASSISTANT: Sure, I am here to help you with that. May I know your travel dates please?

USER: My planned travel dates are Mar 29th and Mar 31st.

ASSISTANT: Can you please share your connection limit?

USER: I need a single connecting flight.

ASSISTANT: Do you have any particular time for departing and returning?

USER: I prefer to return in the afternoon.

ASSISTANT: I there any class preferences?

USER: No, thanks for asking.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Ryan Walker, there are no flights available in your route.

USER: That's ok, thanks for checking.

ASSISTANT: Thank you for choosing us.