You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I serve you?

USER: I am Shirley Brown. During to bad weather condition, I want to change my existing reservation, can you help me that?

ASSISTANT: Sure, please give me a moment, let me know reservation is there are not, I will get back to you.

USER: Ok.

ASSISTANT: Thanks for waiting, I am sorry to say that there is no reservation on your name.

USER: Ok no problem. Thank you for your service.

ASSISTANT: Thanks for choosing us, have a nice day.