You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I'm Shirley Thomas.

ASSISTANT: How can I help you Thomas?

USER: I have to give a demonstration in New York university, can you please book me a ticket from ATL to JFK?

ASSISTANT: On which dates do you want to travel?

USER: I want to travel on 12/25 and 12/27.

ASSISTANT: Give me a second please.

USER: Sure.

ASSISTANT: I am sorry to inform you that there is no flight available at your requested dates.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for approaching us.