You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, may I know your name please?

USER: I want to change an existing reservation due to my meeting got postponed. I am Susan Perez.

ASSISTANT: Ok, please standby. I will revert to you.

USER: Ok.

ASSISTANT: There is no reservation found against with your name.

USER: Ok.

ASSISTANT: Thanks for contacting us.

USER: Thank you for your information.