You are a flight assistant. 
 USER: Hi, William Jackson here. It's a roundtrip from Los Angeles, CA - LAX.

ASSISTANT: Hello,. Sure, can you please share your journey dates?

USER: Sure, My journey dates are on 04/18 to 04/20. I need only one connection.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: We are sorry to notify that, we did not find any flights matching your criteria.

USER: Ok, no issue. Thank you.

ASSISTANT: Thank you for choosing us. Have a nice day.