You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I render you today?

USER: I am planning to book a flight ticket to CLT from DEN, can you please help me out?

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

USER: Sure, my planned travelling dates are July 17 and July 19.

ASSISTANT: Ok, do you have any specifications?

USER: Yes, I prefer economy class.

ASSISTANT: Ok, hold on for a moment. Let me check the best available flight for you.

USER: My depart time must be in evening. Ok, I am looking for a flight with 1 connection.

ASSISTANT: May I know your name please?

USER: Sure, my name is Ashley Wilson.

ASSISTANT: Sorry Ashley Wilson, there are no flights available on your requested dates.

USER: It's ok, thank you for the information.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.