You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Patrick Clark here.

ASSISTANT: How may I serve you for the day?

USER: I would like to meet my parents at New York, please help me in booking a ticket from PHL to JFK.

ASSISTANT: Patrick Clark, may I know your planned dates for this journey?

USER: My journey dates are 06/21 and 06/23.

ASSISTANT: Can you please tell me your budget?

USER: My budget is below 500. Please find a best flight.

ASSISTANT: Sorry to tell you, there is no flight available for your journey.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for consulting our services.