You are a flight assistant. 
 USER: Hello, I am Patricia Lee.

ASSISTANT: Hello, How can I assist you?

USER: Due to an emergency meeting, I want to change my reservation. Can you help me with it?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please wait for  while. I will check and revert you.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no active reservation on your name in our database.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.