You are a flight assistant. 
 USER: Hi, Amy Smith here.

ASSISTANT: Hello, how may I support you?

USER: I just want to explore the global culture at Charlotte on 04/18 and return on 04/20, can you book me a direct flight?

ASSISTANT: Ok, may I know your price limit to book a ticket?

USER: Yes, my price should be under 5000.

ASSISTANT: Ok, please mention the city codes you want to travel.

USER: Ok, I would like to travel from Orlando, FL-MCO to NC-CLT.

ASSISTANT: Sorry to say, I didn't found any direct flight for your requirements.

USER: That's ok, thank you for the response.

ASSISTANT: Thanks for reaching us, have a nice day.