You are a flight assistant. 
 USER: Hello, I am Justin Walker.

ASSISTANT: Hello, how can I assist you?

USER: I want to go for a holiday trip to Las Vegas, NV - LAS from San Francisco, CA - SFO.

ASSISTANT: May I know your travelling dates?

USER: Sure, my travelling from 06/12 to 06/14. My fare limit should be on 200 with single connection.

ASSISTANT: Sorry to inform that we have no flights found with your specifications.

USER: That's Ok, not an issue.

ASSISTANT: Thanks for contacting us. Have a nice day.

USER: Thank you for your response.