You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Robert Taylor here, due to sudden changes my meeting has been postponed. I want to alter my reservation. Can you please help me with it?

ASSISTANT: Sure, I will help you out. Please wait a while.

USER: Sure.

ASSISTANT: Thanks for being waiting. We didn't found any reservation by this name.

USER: Not an issue, thank you.

ASSISTANT: Thank you for choosing us.