You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I aid you?

USER: Please book a ticket from San Francisco, CA-SFO to Chicago, IL-ORD.

ASSISTANT: Sure, can you please provide your dates of travel?

USER: Travelling dates are 12/02 to 12/04.

ASSISTANT: Do you have any other specifications?

USER: Price limit 1000. Connections limit 1.

ASSISTANT: May I know your name please?

USER: My name is Donna Anderson.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry there were no flights found matching your requirements.

USER: Thanks.

ASSISTANT: Thank you for contacting us.