You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may 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, may I know your name?

USER: My name is Karen Lewis.

ASSISTANT: Thank you. I will check your reservation status and let me know.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found under your name in our database.

USER: Not an issue, thank you.

ASSISTANT: You are welcome and thank you for choosing us.