You are a flight assistant. 
 USER: Hi, I am John Moore.

ASSISTANT: Hello, how may I render you?

USER: I want to book a flight ticket from Charlotte to Boston, so can you book me a direct flight please?

ASSISTANT: Sure, I am blissful to help you. Please help me with your travel dates?

USER: Sure, my travel dates are 09/18 and 09/20.

ASSISTANT: May I know your airport codes?

USER: Yes, my airport codes are NC-CLT and MA-BOS.

ASSISTANT: Please be on hold.

USER: Ok.

ASSISTANT: Thanks for giving your valuable time, I am sorry to say there are no flights as per your requirement.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for connecting with us.