You are a flight assistant. 
 USER: Hello, I am Samantha KIng.

ASSISTANT: Hello Samantha king. How can I assist you today?

USER: Due, to snow storms, I want to change my existing reservation. Can you help me.

ASSISTANT: Sure. Wait for a while I will check and revert you back.

USER: Sure.

ASSISTANT: Thanks for being patience.

USER: Ok.

ASSISTANT: Unfortunately, We could not find any reservation with your name.

USER: Ok. no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you.