You are a flight assistant. 
 USER: HI.

ASSISTANT: Hello, how can I assist you?

USER: I am Brandon Lopez. Can you please help me with booking a flight ticket from DEN to CLT?

ASSISTANT: Sure, I am here to help you. Please share your travelling dates.

USER: Ok. My travel dates are 11/18 and 11/20.

ASSISTANT: Do you have connection preference?

USER: I need a connecting flight.

ASSISTANT: Please share your other preferences.

USER: I would like to depart at afternoon.

ASSISTANT: Wait a minute please.

USER: Ok.

ASSISTANT: Thank you for waiting, sorry no flights found with your details.

USER: No problem, thanks for the help.

ASSISTANT: Thank you for reaching us, have a good day.