You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how do you wish me to help you?

USER: Please book a ticket from Chicago IL-ORD to Chicago IL-ORD. Dates are 12/04-12/06.

ASSISTANT: Sure, I will be very happy to help you. Just give me some time to check and get back to you. And, may I please know your full name?

USER: Charles Hall. Price limit is 5000 with connection 0.

ASSISTANT: Thank you Charles for being patient. But, I am very sorry to inform you that there is no flight available according to your credentials.

USER: Thanks.