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

ASSISTANT: Hello, How can I assist you?

USER: I am planning to attend music concert at JFK, can you please help me with booking a flight ticket from ORD?

ASSISTANT: Sure, May I know the travel dates?

USER: Sure, I would like to depart on Apr 28 and return on Apr 30.

ASSISTANT: Please wait a moment.

USER: Ok, but please make sure that the price limit does not exceed 500.

ASSISTANT: Sorry, No flights found with your selected dates.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for choosing us.

USER: You are welcome.