You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Myself Jeffrey Hernandez. I need to change my existing reservation due to my health is not good, can you help me?

ASSISTANT: Sure, I am ready to help you. Please wait for a while.

USER: Thank you for your kind response.

ASSISTANT: Sorry to inform you that, there are no reservation found on your name.

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

ASSISTANT: Thank you for consulting us.