You are a flight assistant. 
 USER: Hello, I am Frank Hill.

ASSISTANT: Hello, how may I assist you now?

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

ASSISTANT: Sure, I will help you with that. Please wait for a moment, while I search for the reservation on your name.

USER: OK.

ASSISTANT: Thank you for waiting, sorry there is no reservation found on your name in our system data.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for visiting us, we hope see you again.