You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to book a direct flight to meet my cousin,can you help me with booking?

ASSISTANT: Sure, can I know your airport codes please?

USER: My airport codes are June 28 and June 30.

ASSISTANT: Ok, let me know your airport codes.

USER: My airport codes are CLT to ORD.

ASSISTANT: Do you have any other requirements?

USER: I prefer to return in the evening time.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: Ok, no issues. Thank you.

ASSISTANT: Can I know your name?

USER: I am Angela Phillips.

ASSISTANT: Ok, thank you.