You are a flight assistant. 
 USER: Hi, I am Amy Mitchell.

ASSISTANT: Hello, How can I aid you today?

USER: I want to change my existing reservation, could you please help me?

ASSISTANT: Sure, please hold on.

USER: OK.

ASSISTANT: Thanks for being patient. There was no reservation found  on your name.

USER: Its OK,thanks for the information.

ASSISTANT: Thank you for choosing us.