You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you now?

USER: Can you book a flight ticket from CLT to SEA?

ASSISTANT: Sure, please share me your planned journey dates?

USER: I want to travel in Apr from 19th to 21st.

ASSISTANT: May I know your connection limit?

USER: I want a direct flight.

ASSISTANT: Please mention your class preference?

USER: I prefer business class seats.

ASSISTANT: Do you have any other requirement?

USER: No.

ASSISTANT: May I know your good name please?

USER: Justin Adams here.

ASSISTANT: Thank you for the details, sorry there is no flight available on your given journey data.

USER: That's ok, thanks for checking.

ASSISTANT: Thank you for reaching us, we hope see again.