You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Brenda Mitchell. I want to change my existing reservation due to bad weather condition.

ASSISTANT:  Ok, please wait I will revert yoiu.

USER: Sure.

ASSISTANT:  Sorry, no reservation was found on your name.

USER: No problem, thank you.

ASSISTANT: Thank you for availing us.