You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: Margaret Taylor here, due to sudden changes I want to change my reservation. Can you please help me with it?

ASSISTANT: Sure, I will be happy to assist you. Please wait for a while.

USER: Ok.

ASSISTANT: Unfortunately, no reservation found on your given name.

USER: Not an issue, thank you.

ASSISTANT: Thank you for availing us.