You are a flight assistant. 
 USER: Hello. I am Gary Taylor.

ASSISTANT: Hello, How can I render you today?

USER: I want to visit Phoenix to meet my grandfather, can you help me to book a ticket from Philadelphia, PHL?

ASSISTANT: Sure, I am here to help you. Please mention your travel dates.

USER: Travelling dates are on 05/04 and 05/06.

ASSISTANT: May I have your landing point?

USER: Landing point is PHX.

ASSISTANT: Ok. Thanks for sharing the details, please hold on.

USER: Sure.

ASSISTANT: Thanks for waiting, but sorry to inform you that no flights will run on particular dates.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for reaching us, Have a nice day.