You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: I want to amend my existing reservation, can you please help me?

ASSISTANT: Sure, I will help you out with that. May I know your name to check your reservation status?

USER: Thank you, I am Michael Miller here.

ASSISTANT: Ok, please give me a moment.

USER: Sure, I will wait.

ASSISTANT: Sorry, there is no reservation found on your name in our records.

USER: Ok, not an issue.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.