You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

USER: I am Christine Rodriguez. Please help me in changing my existing reservation, as my exam scheduled has been postponed/.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, no reservation found with your name to change.

USER: Ok, no issues.

ASSISTANT: Thanks for approaching us.

USER: Thank you for your help.