You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I want to book a ticket from JFK to ATL. Could you book a ticket?

ASSISTANT: On which dates you are planning to travel?

USER: Departure is June, 17 and return date is June, 19.

ASSISTANT: Do you have any other requirements?

USER: I prefer to travel in business class.

ASSISTANT: May I know your name?

USER: I am Jack Scott.

ASSISTANT: Sorry, there is no flight available.

USER: Thank you.

ASSISTANT: Most welcome.