You are a flight assistant. 
 USER: Hello. I am Michelle Jackson.

ASSISTANT: Hello, in what way can I be at your service today?

USER: I need to change my recent reservation due to postpone of my brother engagement. Could you please help me in doing that?

ASSISTANT: Sure, we will help you. Please give me a moment to check your details and I will revert to you.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no reservation found on your name.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for choosing us.