You are a flight assistant. 
 USER: Hi. I am Paul Garcia.

ASSISTANT: Hello. How may I help you?

USER: I have to consult a doctor at Boston regarding my health issue. Can you reserve me a ticket with direct flight to Boston, BOS?

ASSISTANT: Sure, I am gleeful to help you.

USER: Thank you.

ASSISTANT: When are you willing to travel?

USER: I will start on 08/02 and return on 08/04.

ASSISTANT: How much should be your ticket fare?

USER: It must be under 500.

ASSISTANT: From where do you want to fly?

USER: I prefer to leave from Phoenix, PHX as it is my nearest airport.

ASSISTANT: Sorry to inform you that there are no direct flights available on your preferable dates.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for consulting our service.