You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: I want to change my existing reservation, due to some health issue. Can you please help me out?

ASSISTANT: Sure, I will help you about that. Can you please provide your name to check the reservation status?

USER: My name is James Anderson.

ASSISTANT: Please wait for sometime to check in our booking list.

USER: Ok, I will wait for your information.

ASSISTANT: Sorry for the trouble which is caused to you, I have not found any reservation on your name in our database.

USER: That's ok, thank you for checking.

ASSISTANT: You are welcome, thank you for reaching us.