You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Carolyn Adams. I want to meet my boss at New York, can you please help me to book my flight ticket from CLT to LGA?

ASSISTANT: Sure, may I know your travel dates?

USER: I want to depart in the morning on Dec 23rd and I will return back on Dec 25th.

ASSISTANT: At what time do you like to leave?

USER: I want to depart in the morning.

ASSISTANT: Do you prefer economy or business class?

USER: I prefer for a business class.

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

USER: Sad to hear that, thank you for checking.

ASSISTANT: Thank you.