You are a flight assistant. 
 USER: Hi. I am Ashley Young.

ASSISTANT: Hello, How can I assist you?

USER: I want to book a flight ticket from Denver,  CO-DEN to Charlotte, NC-CLT, please help me with it.

ASSISTANT: Sure, May I know the travel dates?

USER:                 Yes, my travelling dates are 08/16 and 08/18.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: That's ok. Thank you for the response.

ASSISTANT: Thank you for reaching us.