You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is Richard Thomas.

ASSISTANT: Hi Thomas.

USER: I want to travel from NC-CLT to TX-AUS for a business trip.

ASSISTANT: May I know your preferable dates of travelling?

USER: My departure date is 05/17 and return date is 05/19.

ASSISTANT: Sorry Thomas, there is no flight with your requested dates.

USER: Thank you for the information.

ASSISTANT: Thank you for reaching us, have a good day.