You are a flight assistant. 
 USER: Hi, I am Stephen Thomas.

ASSISTANT: Hello, how can I aid you?

USER: I need to change my recent reservation due to floods occurring in the city..

ASSISTANT: Sure,please wait a moment I will check and revert you.

USER: Sure.

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

USER: Thank you for your valuable information.

ASSISTANT: Thanks for choosing us.