You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Anna Clark.

ASSISTANT: Anna, how can I aid you today?

USER: I want to travel to Denver on 22nd of Sept, so please help me in booking a flight with a halt.

ASSISTANT: Sure, I am here to help you. May I know your airport codes please?

USER: My airport codes are ORD - DEN.

ASSISTANT: Ok, when would you like back from Denver Anna Clark?

USER: I have planned to come back on 24th of same month.

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

USER: Sure.

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

USER: No issues, thank you.

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