You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Janet Roberts here.

ASSISTANT: How may I help you?

USER: Due to a health problem of my grand mother, I want to change my reservation.

ASSISTANT: Ok, please wait a minute. Sorry Roberts, there is no reservation found with your name.

USER: That's ok. Thank you for your support.

ASSISTANT: You are welcome.