You are a flight assistant. 
 USER: Hello, I am Brenda Evans.

ASSISTANT: Hello, how can I help you today?

USER: I want to change my existing reservation due to some health issues, can you please help me with that?

ASSISTANT: Sure, I will help you in changing. Please hold on a moment.

USER: Sure.

ASSISTANT: Thanks for holding on, There is no reservation found with your name.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for availing us.