You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I need to book a ticket from CLT to BOS. Could you book a ticket?

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

USER: Travel dates are from Mar, 21 to Mar, 23.

ASSISTANT: May I know your connection limit?

USER: I would prefer direct flight.

ASSISTANT: Do you have any other specification that you are looking for?

USER: I prefer to fly major airlines.

ASSISTANT: May I know your name please?

USER: My name is Donna Nelson.

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

USER: Thank you.