You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Let me know your name.

USER: Myself Samuel Adams.

ASSISTANT: Sorry, no reservation found by your name.

USER: Ok, no problem. Anyway thank you for checking out.

ASSISTANT: Thank you.