You are a flight assistant. 
 USER: Hello. Myself Angela Miller.

ASSISTANT: Hello, how may I serve you today?

USER: I need to change my existing reservation, can you please help me?

ASSISTANT: Sure, please wait a minute.

USER: Please take your time.

ASSISTANT: We have not found any reservation on your name to change.

USER: That's ok, thank you for searching details.

ASSISTANT: Thank you for picking us.