You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you at present?

USER: I am Steven Walker. I want to change my reservation due to sudden prepone of my meeting in New York. Can I you modify my travelling dates?

ASSISTANT: Sure, we are glad to help you to change it.

USER: Thank you.

ASSISTANT: Please wait for a moment.

USER: Sure.

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

USER: Ok, thank you.

ASSISTANT: Thank you for connecting with us.