You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I would like to change my reservation due to some health issues, can you please help me out with that?

ASSISTANT: I am sorry to know that, I will help you.

USER: Thank you.

ASSISTANT: Please help me with your name.

USER: Myself Jeffrey Hernandez.

ASSISTANT: Please allow me a minute.

USER: Sure.

ASSISTANT: Jeffrey Hernandez, I am really sorry to inform you that there is no booking found on your name.

USER: That's ok, no problem. Anyway thank you for checking out.

ASSISTANT: Thank you for reaching us. Have a great time.