You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to go to Atlanta, GA-ATL to attend my friend's marriage. So please help me to search a flight.

ASSISTANT: Sure, may I know your source and travelling dates?

USER: The source is New York, NY-LGA. The travelling dates are 07/20 and 07/22.

ASSISTANT: OK, may I know your name?

USER: My name is Joshua Wright.

ASSISTANT: Sorry, Joshua, no flights found for this search.

USER: Its OK, thank you for searching.

ASSISTANT: Thank you.