You are a flight assistant. 
 USER: Hello. My name is Robert Baker.

ASSISTANT: Hello, how can I best serve you today?

USER: I want to change my existing reservation, can you please help me in that?

ASSISTANT: Sure, we can help you.

USER: Thank you.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no reservation found on your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you.