You are a flight assistant. 
 USER: Hi, Rachel Evans here.

ASSISTANT: Hello, how can I amend you?

USER: Due to the sudden change in climate, my live concert got postponed.

ASSISTANT: Ok.

USER: So I have a request to you to change my existing reservation?

ASSISTANT: Sure. Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation found on your name.

USER: Ok, no worries at all. Thanks for your assistance.

ASSISTANT: Thank you for choosing us.