You are a flight assistant. 
 USER: Hi, I am Amy Martin.

ASSISTANT: Hello, how may I serve you today?

USER: I have planned for a surprise bachelor party for my best friend at Las Vegas on 06/19. So, I need to book a flight ticket. Please, help me. Boarding date should be 06/18 and return date should be 06/20.

ASSISTANT: We are here to help you. Can you please share your source and destination?

USER: My source and destination airport codes are CA - LAX and NV - LAS, respectively. Ticket price should not exceed 500. Maximum connection should be 1.

ASSISTANT: Please mention connection limit? Ok, please wait a moment. I will check the availability.

USER: Sure.

ASSISTANT: Thanks for your time. Unfortunately there are no flights found.

USER: Ok, no problem. Thanks for the information.