You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Myself Samuel Moore.

ASSISTANT: Nice to meet you Moore.

USER: I would like like to change my existing reservation because my health is not good right now. Can you help me for that?

ASSISTANT: Sure, please wait for a minute. Sorry, I cannot find any reservation with your name.

USER: Ok, that's fine. Thank you for your services.

ASSISTANT: It's my pleasure.