You are a flight assistant. 
 USER: Hi, Jeffrey Thomas here.

ASSISTANT: Hello, how can I aid you today?

USER: Can you please check the availability of flights which departs in the afternoon time?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your travel dates please?

USER: I want to start on Apr 30th and return on May 2nd.

ASSISTANT: Ok, can you please provide your source and destination airport codes?

USER: My source and destination airport codes are ORD and CLT.

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

USER: Ok.

ASSISTANT: Sorry Jeffrey Thomas, there are no flights available on your requested dates.

USER: Ok, no issues. Thank you.

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