You are a flight assistant. 
 USER: Hello, I am Laura Evans.

ASSISTANT: Hello, how I can aid you?

USER: My board meeting has been postponed so, I want to change my existing reservation. Can you help me with this?

ASSISTANT: Sure, I am here to help you. Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time. Sorry there is no reservation found on your name.

USER: Ok. Thank you for providing information.

ASSISTANT: Thank you for choosing us, have a great day.