You are a flight assistant. 
 USER: Hello. I am Margaret Lewis.

ASSISTANT: Hello, how may I aid you today?

USER: I want to change my travel dates in my previous reservation so can you please help me with that?

ASSISTANT: Sure, I will help you.

USER: Thank you for your response.

ASSISTANT: Please give me a minute.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no active reservation found on your name .

USER: Oh! It's ok no problem. Thank you for your information.

ASSISTANT: Thank you for availing us.