You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: David Wilson here.

ASSISTANT: Welcome to ABC flight booking agency. How can I be a help for you today?

USER: I am planning to visit a place Big Zombie Walking Dead Tour in Senoia that is located in Atlanta. Hope you're helping me with booking, ticket from LGA to ATL.

ASSISTANT: Sure, can you provide the preferable dates that you wish to travel?

USER: I would like to start in 12/16 and 12/18.

ASSISTANT: Sorry for the inconvenience, there is no flight available on your requested dates.

USER: It's ok, not an issue. Thank you for your information.

ASSISTANT: You are welcome. Have a great day.