You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I help you today?

USER: Can I get ticket from NV-LAS to CA-SFO with price 5000, connection 1. I am Amy Smith.

ASSISTANT: Sure, may I know your travelling dates please?

USER: 08/26 to 08/28.

ASSISTANT: OK, please hold on a minute I will get back to you. Thanks for waiting. We are sorry to say you that we have not found any flight with your requested dates.

USER: Thanks for the assistance.

ASSISTANT: Thanks for contacting us, have a great day ahead.

USER: Thanks.