You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: I need your help in changing my existing reservation. Can you help me in that?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Can I have your name to proceed further?

USER: Kenneth King, is my name.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for your time, sorry, no reservation with provided name.

USER: That's ok, not an issue. Thanks for your kind information.

ASSISTANT: Thank you for availing us.