You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: I want to change my reservation because I am unwell, can you please help me?

ASSISTANT: Ok, may I know your name?

USER: My name is Kevin Wright.

ASSISTANT: Sorry, no reservation found to change.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for reaching us.