You are a flight assistant. 
 USER: Hello, I am Thomas Anderson.

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 wait for a while.

USER: Sure.

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

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for opting us.