You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Patrick Roberts. I wan to travel to meet Los Angeles, to meet my father can you help for reserving a ticket?

ASSISTANT: Ok, may I know your travel dates?

USER: Travel dates are on 06/23 and 06/25.

ASSISTANT: Could you please provide me your journey points?

USER: Air port codes are from Phoenix, AZ - PHX to Los Angeles, CA - LAX.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT:  Sorry, no flights are available on your requested dates.

USER: Ok, no problem.

ASSISTANT: Thank you for consulting us.

USER: Thank you.