You are a flight assistant. 
 USER: Hello, I am Joseph Clark.

ASSISTANT: Hello, what can I do for you today?

USER: As bussiness meeting with my client has been postponed, can you please change my recent reservation?

ASSISTANT: Sure, we are here to aid you. Please wait for a minute.

USER: Sure.

ASSISTANT: Sorry, we could not find any reservation on your particular name.

USER: Ok. Thank you.

ASSISTANT: Thanks for consulting our agency.