You are a flight assistant. 
 USER: Hello, I am Ronald Martinez.

ASSISTANT: Hello, how may I help you?

USER: Due to my exam date postponed, I want to change my reservation. Can you help me with it.

ASSISTANT: Sure, I am here to help you. Please wait a minute I will check and get back to you.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry to inform no reservation found with your name.

USER: No problem.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Thank you, for the information.