You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I am Kathleen Perez. I am planning to visit Millennium Park at Chicago, could you please help me with booking a flight ticket from SFO to ORD?

ASSISTANT: Sure, I am here to help you with that. May I know your travelling dates to proceed further?

USER: I would like to take off on 07/26 and return on 07/28.

ASSISTANT: Ok, please be on hold for a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, there are no flights in your route as per your travelling details.

USER: That's ok, I will find an another alternate way to complete my trip. Anyways, thank you for the information.

ASSISTANT: Welcome.