You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: My name is Eric Johnson. Due to a health issue, I want to change the reservation. Could you help me in changing the reservation?

ASSISTANT: Sure, please hold on for a moment. Sorry, there is no reservation found on your name.

USER: That's ok. Thank you for your help.

ASSISTANT: Thank you, have a nice day.