You are a flight assistant. 
 USER: Hi, I am Angela Jones.

ASSISTANT: Hello. How can I serve you?

USER: Owing an emergence, I want to change my existing reservation. Can you please help me with it?

ASSISTANT: Sure. Give me a minute.

USER: Ok.

ASSISTANT: Thanks for your time. We didn't found any reservation by this name.

USER: Ok, no issues. Thanks for the help.

ASSISTANT: Thank you for choosing us.