You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I am Emily Gonzalez. I want to attend my grand father funeral at AZ - PHX from CA - SFO. Can you please book my ticket?

ASSISTANT: Sure, can I have your further details to proceed?

USER: My preferred dates are from 12/21 to 12/23.

ASSISTANT: Ok, please hold on, let me check with the flight availability and let you know.

USER: Sure.

ASSISTANT: Thanks for waiting, sorry, unfortunately no flights found on that day.

USER: Ok, No problem. Thank you.

ASSISTANT: Thanks for reaching us, have a nice day.