You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I am planning my weekend to travel San Francisco, CA - SFO on 08/22. Can you book me a flight ticket from Phoenix, AZ - PHX?

ASSISTANT: Sure, I will book your ticket. Please wait a moment.

USER: Thank you for the positive response.

ASSISTANT: May I know your return date?

USER: My return to PHX is on 08/24.

ASSISTANT: Ok, may I know your name?

USER: Myself Kevin Garcia.

ASSISTANT: We didn't found any flight on your requested dates.

USER: That's so sad for me. Thank you for the information.

ASSISTANT: Welcome.