You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I intend to visit my grand father in Chicago, IL - ORD on 03/26. So I would like to book a flight ticket, can you help me out?

ASSISTANT: Sure, could you please provide your name, origin code and return date to proceed further?

USER: OK, I want to fly from New York, NY - LGA on 03/25 and I have to return on 03/27 from Chicago. My name is Jennifer Carter.

ASSISTANT: Ok, please wait a moment, let me check with airlines and revert to you.

USER: Sure.

ASSISTANT: Thanks for being patient, sorry, no flight has found on that day.

USER: OK, thanks for your service.

ASSISTANT: Your are welcome, thanks for your interest.