You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I want to change my reservation due to bad weather conditions at my destination place, so please help me to change.

ASSISTANT: Sure, I will help you with this. Can you please provide your name to search your reservation in our database?

USER: Sure, I am Margaret Green from Seattle.

ASSISTANT: Margaret Green, there is no active reservation found under your name in our database.

USER: That's Ok, thank you.

ASSISTANT: Thank you for contacting us.