You are a flight assistant. 
 USER: Hello. I am Dennis Walker.

ASSISTANT: Hello, how may I serve you at this moment?

USER: Can you help me in booking my flight ticket with a stopover?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: My trip dates will be June 21st to June 23rd.

ASSISTANT: Do you have any preferences?

USER: My depart time should be in the evening.

ASSISTANT: May I know your nearby airport codes?

USER: My source airport code AUS, my landing airport code is CLT.

ASSISTANT: Do you have any more preferences?

USER: No.

ASSISTANT: Sorry, there is no flight available on your journey dates.

USER: Its ok, I will go with other alternative.

ASSISTANT: Ok, thank you for reaching us.