You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Matthew Edwards. I am planning to change my reservation, due to health issue.

ASSISTANT: Please wait for a moment.

USER: Can you please change my reservation?

ASSISTANT: Sorry, there is no reservation found basis on your details.

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

ASSISTANT: Thank you for reaching us.

USER: Most welcome.