You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Richard White.

ASSISTANT: How may I assist you today?

USER: Can you change my existing reservation to new travel dates?

ASSISTANT: Sure. Please wait for a minute.

USER: Sure, take your time.

ASSISTANT: I could not find any reservation with your name.

USER: It's ok, thanks for your service.

ASSISTANT: It's my pleasure.