You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Please change my existing reservation due to some health issues?

ASSISTANT: I am sorry to know that, I will help you. Please help me with your name.

USER: I am George Scott.

ASSISTANT: Please allow me a minute.

USER: Sure.

ASSISTANT: George Scott, I am sorry to inform you that there is no booking found on your name.

USER: Ok, not an issue. Thank you for your information.

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