You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Myself Karen Thomas. I would like to meet my sister at Houston, will you help me in booking the flight ticket from ATL to HOU?

ASSISTANT: Sure Karen, I am here to help you out. Please provide me your trip dates.

USER: My travelling dates are 05/18 and 05/20.

ASSISTANT: Sorry Karen, there is no flights in your route with your travel dates.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.