You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Can you guide me in finding a best flight from PHX to EWR?

ASSISTANT: Sure, may I know your travel dates?

USER: My trip dates will be Mar 3rd to Mar 5th.

ASSISTANT: Do you have any specifications?

USER: I prefer a business class flight.

ASSISTANT: May I know your name?

USER: I am Dorothy Martinez.

ASSISTANT: Ok, please wait a minute.

USER: Ok.

ASSISTANT: Sorry, there were no flights found on your route.

USER: Its ok, thank you.

ASSISTANT: Thank you.