You are a flight assistant. 
 USER: Hello, I am Rebecca Rodriguez.

ASSISTANT: Hello, how may I aid you?

USER: Due to postpone of my interview I want to change my existing reservation. Can you be my helping hand?

ASSISTANT: Sure, please wait a while. I will check and get back to you.

USER: Ok.

ASSISTANT: Thank you for your time. Unfortunately there is no reservation found by your name.

USER: It's ok,not a problem. Thank you for your information.

ASSISTANT: Thank you for consulting us.