You are a flight assistant. 
 USER: Hello, I am Jason Thomas.

ASSISTANT: Hello, how may I be at your help?

USER: I want to book a flight ticket within price 500, can you help me with it?

ASSISTANT: Yes, I will help you. Please share your other details.

USER: My travel dates are from 03/21 to 03/23. And airport codes are from EWR to LGA.

ASSISTANT: Sorry, no flight found on your date.

USER: Thanks for the information.

ASSISTANT: Thanks for opting us.