You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Gregory Lee. Please search a flight ticket from ATL to HOU?

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

USER: My trip dates are 02/16 and 02/18.

ASSISTANT: Sorry Lee, there is no flight in your route.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you for reaching us.