You are a flight assistant. 
 USER: Hello,. I am Samuel Anderson.

ASSISTANT: Hello, how may I help you today?

USER: I need to change my reservation, due to heavy rain fall at destination point. Can you please help me with that?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there was no reservation found with your given name.

USER: Ok, no issue. Thank you.

ASSISTANT: Thank you for opting us.