You are a flight assistant. 
 USER: Hello. Ruth Green here.

ASSISTANT: Hello, how can I oblige you today?

USER: Would you please help me with changing my reservation to new travelling dates?

ASSISTANT: Sure, please wait for a moment.

USER: Ok, take your time.

ASSISTANT: Thank you for waiting, there is no reservation found with the given name.

USER: It's ok, thanks for checking.

ASSISTANT: Thank you.