You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Joseph Mitchell. I need to book a ticket from ATL to DEN, can you help me?

ASSISTANT: Sure, may I know your travel dates?

USER: My travelling dates are 02/19 to 02/21.

ASSISTANT: Do you have any specifications?

USER: I need one connecting flight.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your route.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us.