You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you please help me to book a flight from PHX to JFK?

ASSISTANT: Please provide your travelling dates.

USER: I want to travel on Jan 8 and need to return on Jan 10.

ASSISTANT: Do you have preference?

USER: I need a direct flight. I prefer an normal-cost airline to travel.

ASSISTANT: May I know your name?

USER: Myself Brian Clark.

ASSISTANT: Sorry, there is no flight with your requirement.

USER: Ok, not an issue.

ASSISTANT: Thank you.

USER: Thank you for checking.