You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I aid you?

USER: I am Brian Thompson. I want to attend a seminar at Phoenix, PHX. Can you help me in booking from Boston, BOS?

ASSISTANT: Ok, can I know your travelling dates?

USER: My travelling dates are from 11/03 to 11/05.

ASSISTANT: May I know your price limit?

USER: I can bare up to 500.

ASSISTANT: Sorry, we have flight for 600 price.

USER: Ok, No problem. Thank you.

ASSISTANT: Thank you for reaching our service.