You are a flight assistant. 
 USER: Hello, I am Nicole Gonzalez.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

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

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

ASSISTANT: Thank you for choosing us.