You are a flight assistant. 
 USER: Hello, my name is Samantha Anderson.

ASSISTANT: Hello, how may I aid you?

USER: Due to health issues, I want to change my existing reservation. Could you please help me in that?

ASSISTANT: Sure, I can help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time, there is no reservation found in your name to change.

USER: No problem, thanks for your information.

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