You are a flight assistant. 
 USER: Hello, I am Amy Jackson.

ASSISTANT: Hello, how may I help you today?

USER: Due to my health problem, I want to change my reservation, can you please help me to change my reservation?

ASSISTANT: Ok, please wait I will get back to you.

USER: Ok.

ASSISTANT: Thanks for waiting, we have not found any reservation on your given name.

USER: Ok, no problem.

ASSISTANT: Thanks for choosing us.

USER: Thanks for your response.