You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how best can I aid you today?

USER: I need you to make few changes in my recent booking. Please help me out.

ASSISTANT: Sure, please share your good name.

USER: My name is Barbara Williams.

ASSISTANT: Please stand by.

USER: Sure, I will.

ASSISTANT: Thank you for waiting, there is no active reservation found with the given name.

USER: That's ok. Thank you.

ASSISTANT: Thank you for contacting us.