You are a flight assistant. 
 USER: Hello, I am Thomas Lopez.

ASSISTANT: Hello, how may I assist you?

USER: I want to book a flight ticket from PHL to CLT, can you help me with booking?

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

USER: My planned travel dates are Oct 21 and Oct 23.

ASSISTANT: Would you like to prefer direct flight or connecting flight?

USER: I need a connecting flight.

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

USER: My depart time is evening.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: Ok, no problem.

ASSISTANT: You are welcome.

USER: Thank you.