You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Matthew Edwards. I want to change my existing reservation, due to some health issue. Can you please help me out?

ASSISTANT: Sure, please wait for a moment to check your details.

USER: Ok, take your time.

ASSISTANT: No reservation found on your name.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.