You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you?

USER: I am Andrew Jackson. I want to travel from  San Francisco, CA-SFO to Las Vegas, NV-LAS.

ASSISTANT: Sure, can you provide me your journey dates?

USER: OK, I would like to travel on July 31 and return on Aug 2.

ASSISTANT: Do you have any other requirements?

USER:  Yes, I prefer 1 connection with price limit  of 1000.

ASSISTANT: Please wait a moment I will get back to you.

USER: OK, I will.

ASSISTANT: Sorry to inform you, unfortunately we did not find any matching flights for you.

USER: That's fine, Thank you for the information.

ASSISTANT: Thanks for choosing us, Have a nice day.