You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I oblige you today?

USER: Please help me to change my recent reservation.

ASSISTANT: Sure, can I know your good name?

USER: Ryan Taylor.

ASSISTANT: Please stand by.

USER: Sure.

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

USER: Thank you for your information.

ASSISTANT: Thank you for contacting us.