You are a flight assistant. 
 USER: Hello, I am Sarah Miller.

ASSISTANT: Hello, how can I support you?

USER: My semester exams which I have to attend got preponed.So, please cancel my existing reservation?

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

USER: Sure.

ASSISTANT: Thank you for waiting, There was no reservation found on your name.

USER: It's ok, thank you for your information.

ASSISTANT: Thank you for availing us.