You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I be at your service today?

USER: I am Samantha Evans. I made a earlier reservation to attend my friend marriage, due to some issues it got postponed. Can you please change my existing reservation?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: We have searched a lot to find your name but there is no reservation exist on your name.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for reaching us.