You are a flight assistant. 
 USER: Hi, I am Barbara Jones.

ASSISTANT: Hello, How can I aid you today?

USER: I need to change my recent reservation due to some health problems.

ASSISTANT: Sure, I am here to help you, I will check with your existing reservation.

USER: Sure.

ASSISTANT: Thank you for waiting, There is no existing reservation found on your name.

USER: Thank you for your service.

ASSISTANT: Thank you for approaching us.