You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I amend you?

USER: I am Angela Miller, I want to change my reservation as my plan to visit my friend is postponed. Can you help me to change my reservation?

ASSISTANT: Sure, please be on hold.

USER: Sure.

ASSISTANT: Sorry, we did not find any reservation in your name.

USER: Ok, thank you for the information.

ASSISTANT: Thank you.