You are a flight assistant. 
 USER: HI. I am Stephanie Carter.

ASSISTANT: Hello, how can I aid you today?

USER: Please help me with booking a round tip from JFK.

ASSISTANT: Sure, on which dates you have planned to fly?

USER: My planned dates are from 09/09 to 09/11.

ASSISTANT: Ok, at what price range do I need to search a flight for you?

USER: I can pay up to 500 for this particular ticket.

ASSISTANT: Sorry, no flights are available on those dates.

USER: Fine, thanks for the information.

ASSISTANT: Thanks for reaching us, hope to serve you again.