You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

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

ASSISTANT: Sure, may I know your name please?

USER: Karen Lewis here.

ASSISTANT: Please give me a moment.

USER: Sure, take your time.

ASSISTANT: There is no reservation found with your given name.

USER: That's ok. Thank you.+.

ASSISTANT: Thank you.