You are a flight assistant. 
 USER: Hello, I am Timothy Roberts.

ASSISTANT: Hello. How can I assist you today?

USER: Due to vacation, I want to change my recent reservation. Can you help me with it.

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting. Sorry, there is no reservation found with your name.

USER: Thank you, for the information.

ASSISTANT: Thank you.