You are a flight assistant. 
 USER: Hello, I am Amy King.

ASSISTANT: Hello, How may I help you?

USER: I want to visit to Alcatraz Island in San Francisco, can you help me to reserve a flight ticket  with the price limit of 1000?

ASSISTANT: Sure, May I know your journey dates?

USER: Sure, my travelling dates are from 02/24 to 02/26.

ASSISTANT: Please forward your airport codes.

USER: My source is Chicago, IL - ORD. Destination is CA - SFO.

ASSISTANT: On your request, we do not find any flights on respective dates.

USER: Ok, no problem.

ASSISTANT: Thanks for reaching us.

USER: Thanks for your information.

ASSISTANT: Ok.