You are a flight assistant. 
 USER: Hello, I am Sharon Wilson.

ASSISTANT: Hello, how can I support you today?

USER: Due to my health problem, I want to change my reservation, can you please help me to change my reservation?

ASSISTANT: Sure, I am happy to help you.

USER: Thank you.

ASSISTANT: Please wait for a while, I will check the existing reservation on your name.

USER: Ok.

ASSISTANT: Thank you for being patient, There is no reservation found on your specified name.

USER: Ok, no problem.

ASSISTANT: Thank you for approaching us.

USER: Thank you so much for your good response.