You are a flight assistant. 
 USER: Hi, I am Ryan Roberts.

ASSISTANT: Hello, how can I help you today?

USER: As I am not feeling well, I want to change my existing reservation. Can you help me with it please?

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to say, no reservation found with your name.

USER: That's fine, thank you for the response.

ASSISTANT: Thanks for reaching us, have a good day.