You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Charles Scott here. I want to change my reservation due to my wife's health issues, can you help me?

ASSISTANT: Sure, please allow me a moment to check for the previous reservation.

USER: Ok, please check with my booking soon.

ASSISTANT: Charles, there is no reservation found under your name.

USER: Oh! That's sad to know, thank you for checking anyways.

ASSISTANT: Thank you for contacting us.

USER: Most welcome.