You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hi. How can I help you?

USER: I am Andrew King. I want to meet my friend, he is living in Chicago, can you please help me to book a flight ticket from CLT to ORD?

ASSISTANT: Sure, may I know your date?

USER: My departure date is 08/30 and I want return to CLT from ORD on this date 09/01.

ASSISTANT: I am sorry to say, no flights are available on your details.

USER: It's ok, no problem.

ASSISTANT: Thank you.

USER: Thank you for your information.