You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Janet White. I want to change my existing reservation due to bad weather condition, can you please help me in that?

ASSISTANT: Sure, I help you. Please hold on a moment.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on given name.

USER: Ok, no problem. Thank you for your help.

ASSISTANT: Thank you for reaching us.