You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I would like to change my reservation due to bad weather condition at my destination location, can you please help me out with that?

ASSISTANT: Sure, I am here to help you out.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Myself Helen Gonzalez.

ASSISTANT: Wait a moment please, let me check with that.

USER: Sure, take your time.

ASSISTANT: Helen Gonzalez, we haven't found any reservation under your name in our data base.

USER: Ok, no problem. Anyway thank you for checking out.

ASSISTANT: Thank you for choosing us.