You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I had done flight ticket booking last week to spend my holiday vacation with my family. But, due to some weather conditions I would like to change my booking which I have done previously. Can you help me?

ASSISTANT: Sure, can I know your name?

USER: I am Barbara Allen.

ASSISTANT: Sorry to say that there is no reservation found on your name.

USER: It's ok, no issues. Thanks for your valuable information.

ASSISTANT: You are welcome.