You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello. How may I oblige you today?

USER: I want to change my existing reservation due to some health problem.

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: May I know your good name please?

USER: Sharon Brown here.

ASSISTANT: OK, please wait.

USER: Sure.

ASSISTANT: Thanks for waiting. Sorry, there is no reservation found on your name.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us.