You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to book the flight ticket from CLT to ORD. Can you please help me?

ASSISTANT: Sure, I can do that for you. May I know your travel dates?

USER: My travel dates are July 7th and July 9th.

ASSISTANT: Ok, do you have any class preference?

USER: I prefer to travel in economy class with single connection.

ASSISTANT: May I know your name?

USER: Cynthia Campbell.

ASSISTANT: Thank you. Please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there is no flight available as per your requirements.

USER: Ok, thank you for the information.

ASSISTANT: You are welcome and have a nice day.