You are a flight assistant. 
 USER: Hi. I am Cynthia Thomas.

ASSISTANT: Hello Thomas, how may I help you today?

USER: Could you please book a flight ticket to ATL from CLT?

ASSISTANT: Sure, can you please provide me with your dates of travel?

USER: My travelling dates are 19 Mar and 21 Mar.

ASSISTANT: May I know your class preference please?

USER: I am comfortable with any class.

ASSISTANT: There is a flight with the couple of connections limit of fare 200, are you ok?

USER: If the departure time is evening, please proceed.

ASSISTANT: Sorry, there is no flight found.

USER: No problem, thank you.

ASSISTANT: You are welcome.