You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Donald Taylor, can you please amend my recent reservation?

ASSISTANT: How may I guide you? Sure, I will help you.

USER: Ok, Thank you.

ASSISTANT: Please wait a moment.

USER: Please take your time, I will wait.

ASSISTANT: Donald, no reservation has been found on your name in our database.

USER: No problem. Thank you for informing.

ASSISTANT: Thank you for choosing us.