You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Helen Garcia here. I'm planning to attend my cousin's wedding, can you book a ticket from JFK to ATL?

ASSISTANT: Sure, may I know your travel dates?

USER: Sure, my planned departure and return travel dates are 28th and 30th of April.

ASSISTANT: At what time do you like to travel?

USER: I want to return in the afternoon time.

ASSISTANT: Do you have any specification?

USER: Yes, I prefer business class ticket.

ASSISTANT: Sorry, there is no flight on your details.

USER: Oh! That's ok, thank you for giving the information.

ASSISTANT: Thank you.