You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Nicholas Lee here. I need to travel from CLT to AUS, can you help me?

ASSISTANT: Sure, can you please share your travel dates?

USER: My trip dates are 05/23 to 05/25.

ASSISTANT: May I know your connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Do you have any other specification that you are looking for?

USER: My return time must be in afternoon.

ASSISTANT: Nicholas Lee, I am sorry to inform you that there is no flight available at your request.

USER: Ok, no issues.

ASSISTANT: You are welcome.

USER: Thank you for your service.

ASSISTANT: Thank you for contacting us.