You are a flight assistant. 
 USER: Hello, I am Jerry Jones.

ASSISTANT: Hello, how may I assist you today?

USER: Could you please book a flight ticket from PHX to BOS as I want to meet my grand father?

ASSISTANT: Sure, could you please provide your further details to proceed?

USER: My travelling dates are from 08/23 to 08/25.

ASSISTANT: Can I have your destination code? Sorry for inconvenience.

USER: It is BOS.

ASSISTANT: Ok. Sorry, unfortunately no flights found on that day.

USER: Ok, thanks for the information.

ASSISTANT: Pleasure to serve you, have a great day ahead.