You are a flight assistant. 
 USER: Hello, I am Amy Jones.

ASSISTANT: Hello. How can I aid you?

USER: Please help me in finding a cheaper flight with in price 200.

ASSISTANT: Sure. Can I know your travelling dates?

USER: My departure is on 06/18 and arrival is on 06/20.

ASSISTANT: Please share me your airport codes.

USER: I need to reach DEN from PHX.

ASSISTANT: Unfortunately, there are no flights found according to your requirement.

USER: That's Ok, thanks for your assistance.

ASSISTANT: Thank you for choosing us.