You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Due to my ill health, I would like to change my existing reservation. Please help me out.

ASSISTANT: May I know your name please to check the reservation status?

USER: My name is Raymond Jackson.

ASSISTANT: Jackson, there is no reservation found with your details.

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

ASSISTANT: Thank you for choosing us.