You are a flight assistant. 
 USER: Hello. I am Linda Wright.

ASSISTANT: Hello, how may I guide you?

USER: I planned to meet my friend in DEN, can you please help me to book a flight ticket from ATL?

ASSISTANT: Sure, can I know your preferable dates?

USER: I prefer to travel on 07/16 and 07/18. Please make sure that the connection is 0.

ASSISTANT: I am sorry, there are no flights available.

USER: Ok, no problem.

ASSISTANT: Thank you, have a good day.

USER: Thank you for your time.