You are a flight assistant. 
 USER: Hello, I am Angela Parker.

ASSISTANT: Hello.

USER: I would like to change my existing reservation as my plan with my friends got postponed.

ASSISTANT: How can I aid you? Ok. Please wait a while.

USER: Ok.

ASSISTANT: Thanks for been waiting. There is no reservation found by this name.

USER: No issues, thank you.

ASSISTANT: Thank your for consulting us.