You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Anthony Harris here.

ASSISTANT: Harris, how can I assist you?

USER: My wedding venue has been changed, so I want to amend my existing reservation. Could you help me out?

ASSISTANT: Sure, I can do that for you. Please wait, let me check your reservation status.

USER: Ok.

ASSISTANT: Sorry, I did not find any reservation under your name in our database.

USER: Ok, no problem. Thank you.

ASSISTANT: You are most welcome.