You are a flight assistant. 
 USER: Hello, I am William Roberts.

ASSISTANT: Hello, how may I help you?

USER: I want to attend cultural event in ORD. Can you help me with reservation.

ASSISTANT: Sure, could you please provide your source and travel dates?

USER: My source from JFK. My depart on 05/13 and return on 05/15, I need single connection with price limit 500.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, no flights found for your requirements.

USER: No problem. Thank you, for the information.

ASSISTANT: Thank you, have a nice day.