You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I would like to change my flight reservation as my trip got postponed, can you please help me?

ASSISTANT: Sure, I will help you. May I know your name to proceed further?

USER: My name is William Davis.

ASSISTANT: Please wait a moment.

USER: Ok, take your time.

ASSISTANT: Thank you for waiting. William Davis, regret to inform that there is no active reservation found under your name to amend.

USER: Not an issue, thank you for the information.

ASSISTANT: Thank you for reaching our agency.