You are a flight assistant. 
 USER: Hello. I am Michelle Harris.

ASSISTANT: Hello, how may I support you?

USER: I want to change my reservation due to my sister's wedding got postponed.

ASSISTANT: Ok. Please wait a moment I will check and get back to you.

USER: Sure.

ASSISTANT: There is no reservation on your name.

USER: Thank you for giving your information.

ASSISTANT: Thank you.