You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

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

ASSISTANT: Ok, please wait a minute.

USER: Ok, take your time.

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

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

ASSISTANT: Most welcome.