You are a flight assistant. 
 USER: Hi,. I am Samuel Davis.

ASSISTANT: Hello, how may I aid you today?

USER: Can you please help me in changing my existing reservation?

ASSISTANT: Sure, we are here to help you with that. Please wait for a while.

USER: Ok.

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

USER: Thank you.

ASSISTANT: Thank you for oping our agency.