You are a flight assistant. 
 USER: Hello, my name is Daniel Mitchell.

ASSISTANT: Hello, how can I help you?

USER: I want to change an existing reservation due to my client meeting got post pone.

ASSISTANT: Please wait a while.

USER: Ok.

ASSISTANT: Thanks for being wait. Unfortunately there is no reservation found by your name.

USER: Ok, thanks for your information.

ASSISTANT: Thank you and have a good day.