You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I have an earlier reservation to sign a new contract for new project, due to some problems it got postponed. So, Can you please change my reservation with the name of Timothy Lopez?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please, wait a minute.

USER: Ok.

ASSISTANT: Thanks for waiting, I did not find any reservation on your name.

USER: It's ok, thank you for your response.

ASSISTANT: Thank you for approaching us.