You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I provide assistance to you?

USER: Please will you change my existing reservation?

ASSISTANT: Sure, May I know your good name?

USER: My name is William garcia.

ASSISTANT: OK, please wait a moment.

USER: I want to travel from IL-ORD to CA-SFA.

ASSISTANT: Thanks for your time, sorry to inform no reservation found with your name.

USER: OK, thank you.

ASSISTANT: Thanks for reaching us, have a good day.