You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid 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, we are here to help you. Kindly mention your name to proceed?

USER: Myself Dorothy Wilson.

ASSISTANT: Ok, please hold a moment, let me check your status and let you know.

USER: Ok.

ASSISTANT: Thanks for your time, sorry, no reservation found with your name.

USER: No problem.

ASSISTANT: Thank you for approaching us.

USER: Thank you so much for your time.