You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Patrick Miller, want to alter my recent reservation due to some emergency. Please help me out with that.

ASSISTANT: Sure, I will help you with that.

USER: Thanks.

ASSISTANT: Please be on hold, I will check and revert back to you.

USER: Sure.

ASSISTANT: Sorry to tell you, there is no reservation found on your name.

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

ASSISTANT: You are welcome, thank you for reaching us.