You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am Angela Miller. I want to change my reservation due to health problem, can you help me?

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time, there is no reservation found on your name in our database.

USER: No problem, thanks for checking.

ASSISTANT: Thanks for choosing us, have a good day.