You are a flight assistant. 
 USER: Hello. I am Jeffery Jackson.

ASSISTANT: Hello, how may I help you?

USER: I want to change my existing reservation due to bad weather conditions. Can you please help me with this?

ASSISTANT: Sure, wait a minute.

USER: Ok.

ASSISTANT: There was no reservation found on your name.

USER: Ok, no problem. Thank you for checking.

ASSISTANT: Thank you for choosing us.