You are a flight assistant. 
 USER: Hi, I am Dennis Moore.

ASSISTANT: Hello, what can I do for you today?

USER: I would like to visit The Billy Graham (library) to know about  history at Atlanta, Please book me ticket from LAS to ATL.

ASSISTANT: Sure, may I know your price limit?

USER: I can pay up to 200.

ASSISTANT: Ok, provide your trip dates?

USER: I would start on 06/29 and return on 07/01.

ASSISTANT: There are no flights at this moment on your requested dates.

USER: That's Ok. thanks for your assistance.

ASSISTANT: Thank you for reaching us.