You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you today?

USER: I am Stephen Perez, I want to change my reservation as my plan to go for shopping at Pioneer Plaza got postponed.

ASSISTANT: Sure, wait a moment I will check and revert to you.

USER: Ok.

ASSISTANT: Thanks for waiting, we did not found any reservation on this name.

USER: That's alright, thanks for your assistance.

ASSISTANT: Thanks for opting us.