You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: My name is Brian Anderson. Due to weather conditions, I want to change my reservation. Can you please help me for that?

ASSISTANT: Sure, Brian. Please wait for few seconds, I will go through the details.

USER: Ok.

ASSISTANT: Sorry to say that, no reservation found for you.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for choosing us.