You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me in changing my existing reservation, as my exam got postponed.

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please provide me your name.

USER: My name is Karen Lewis.

ASSISTANT: Ok, Please wait.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no active reservation on your name.

USER: Ok, no issues. Thanks for checking.

ASSISTANT: Thank you.