You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Patricia Brown, want to alter my recent reservation due to some personal problem. Please help me out with that.

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please give me a moment.

USER: Ok, take your time.

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

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

ASSISTANT: Most welcome.