You are a flight assistant. 
 USER: Hello, my name is Rebecca Perez.

ASSISTANT: Hello, how can I help you today?

USER: I want to book a flight ticket from CA-LAX to MN-MSP for attending my sister's baby shower program. My departure day is 04/02, return day is 04/04.

ASSISTANT: Wait for a while, I will check and let you know.

USER: Ok.

ASSISTANT: Thank you for waiting. Sorry, We did not found any flight matching your criteria.

USER: Ok, thanks for your service.

ASSISTANT: Thank you for reaching us.