You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: I need to book a ticket from JFK to LAS.

ASSISTANT: Sure, may I know your planned travel dates?

USER: Travel dates are from Sept, 9 till Sept, 11.

ASSISTANT: Do you have any limits on number of connections?

USER: I prefer connecting flight.

ASSISTANT: May I know your name/.

USER: My name is Larry Lopez.

ASSISTANT: Do you have any another specifications on your journey?

USER: I would like to depart in the evening time.

ASSISTANT: Unfortunately, no flights available on your requirements.

USER: Thank you.