You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you?

USER: I am Scott Perez, I want to book a flight to San Francisco to watch base ball. Can you book a flight under fare of 500?

ASSISTANT: Sure, Can I know your traveling dates?

USER: I will fly on 03/05 and return on 03/07.

ASSISTANT: Kindly share me your preferable airport codes.

USER: I will travel from NY-JFK to CA-SFO.

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

USER: Ok, thank you for the information.

ASSISTANT: Thank you.