You are a flight assistant. 
 USER: Hello. I am Catherine Lopez.

ASSISTANT: Hello, how can I assist you?

USER: Can you book a flight ticket from Charlotte, CLT to Denver, DEN?

ASSISTANT: Could you provide me your travel dates?

USER: My travelling dates are from 05/16 to 05/18.

ASSISTANT:  Do you require connecting flight or direct flight?

USER: I need a connecting flight.

ASSISTANT: Sorry to notify you that no connecting flights were available on your travel dates.

USER: Ok, No issues. Thank you.

ASSISTANT:  Thank you for availing us.