You are a flight assistant. 
 USER: Hello, I am Joshua Lopez.

ASSISTANT: Hello. How may I aid you?

USER: I want to change my reservation as my get together program got postponed. Can you help me in changing?

ASSISTANT: Sure, I am here to help you. Please, standby.

USER: Ok.

ASSISTANT: Thanks for your time, I did not find any reservation on your name to proceed for modification.

USER: That's Ok, thanks for the response.

ASSISTANT: Thank you for reaching us.