You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am George Perez, want to travel from OAK to LAX.

ASSISTANT: May I know your travel dates?

USER: My travel dates are from 07/23 to 07/25.

ASSISTANT: Sorry, there is no flight available.

USER: It's ok, thank you.

ASSISTANT: Most welcome.