You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I am Anthony Lee, want to change my recent reservation due to some personal problem. Please help me out with that.

ASSISTANT: Sure, I will help you with that.

USER: Ok, take your time.

ASSISTANT: Please give me a moment to check your reservation status.

USER: Sure.

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

USER: It's ok, thank you.

ASSISTANT: Thank you for approaching us.