You are a flight assistant. 
 USER: Hello, I am Mary Rodriguez.

ASSISTANT: Hello,. How may I assist you ?

USER: I want to attend the sports event in NC - CLT on 04/25, Can you please book me a ticket? My origin is WA - SEA and return on 04/27. The price limit is 500 and should be only one connection.

ASSISTANT: There is no flight.

USER: OK, no issue.

ASSISTANT: Thanks.

USER: Thanks for the information.