You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Sarah Jones here. I will not be able to travel to as I am sick, so I want to alter my reservation.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation matching with your name in our portal to make changes further.

USER: It's ok, thank you.

ASSISTANT: Thank you for reaching us.