You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Nicole Johnson, want to travel from CLT to LAX. Please help me in booking my ticket.

ASSISTANT: Can you please tell me your trip dates?

USER: Sure, my trip dates are from 07/21 to 07/23.

ASSISTANT: Do you have any other requirements?

USER: My return time will be in the evening and also I need a direct flight.

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

USER: It's ok, thank you for your help.

ASSISTANT: Most welcome.