You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I assist you?

USER: I want to go for wedding party which is at Chicago from Los Angeles , Could you please help me in booking the ticket? My airport codes are CA-LAX and IL-ORD respectively.

ASSISTANT: Sure, may I know your preferable dates of travelling?

USER: My travelling dates are from Feb/05 to Feb/07 and price should be within 1000.

ASSISTANT: Sorry, unfortunately there is no flight matched with your details.

USER: OK, no issues.

ASSISTANT: May I know your name for formalities?

USER: Thanks for the information. My name is Patrick Robinson.

ASSISTANT: OK Patrick, thank you. Have a good day.