You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Emily Moore. I am planning to visit Central Park at New York, could you please help me with booking a flight ticket from IAD to LGA?

ASSISTANT: Sure, can you please share your travel dates?

USER: I would like to depart on Aug 26th and return on Aug 28th.

ASSISTANT: Do you have any class preference?

USER: I prefer business class.

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

USER: ok, not an issue. Anyways, thank you for the information.

ASSISTANT: You are welcome.