You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Due to my ill health, I want to take some rest. I would like to change my existing reservation.

ASSISTANT: Sure, please provide me your name to check the status of the reservation.

USER: My name is Stephanie Carter.

ASSISTANT: Carter, there is no reservation found with your details. Would you like to know anything else?

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

ASSISTANT: Thank you for choosing us, have a good day.