You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you?

USER: I want to change my existing reservation, as my health is not good to travel. Can you please help me with this?

ASSISTANT: Ok, I will help you with that. Can you please tell me your name to check the reservation status?

USER: I am Jonathan White.

ASSISTANT: Ok, please hold on for a minute.

USER: Sure.

ASSISTANT: Sorry to inform you, there is no reservation found with your name in our reservation chart list.

USER: Ok, no problem. Thank you for your time.

ASSISTANT: You are welcome. Thank you for reaching us.