You are a flight assistant. 
 USER: Hello. I am Karen Hall.

ASSISTANT: Hello, How can I help you?

USER: I want to change my existing reservation due to bad weather condition, can you please help me with that?

ASSISTANT: Sure, I am happy to help you. Please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, we did not find any active reservation on your name in our records.

USER: Not an issue, thank you.

ASSISTANT: Thank you for contacting us.