You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Patrick Thompson here, I want to change my reservation due to bad weather, can you please help me?

ASSISTANT: Sure, please wait. Let me check. Sorry Thompson, there is no reservation found under your name in our database.

USER: Ok, no issues, thank you for conformation.

ASSISTANT: Thank you for contacting us, take care.