You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How can I assist you today?

USER: My name is Sandra Williams. My business meeting were postponed so I want to change my existing reservation.

ASSISTANT: Sure Sandra Williams, I will check and get back to you.

USER: Ok.

ASSISTANT: Thanks for your time. Unfortunately, We could not find any reservation with your name.

USER: Thank you, for your service.

ASSISTANT: Thank you for connecting us.