You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you now?

USER: I want to change my existing reservation. Can you help me for this one?

ASSISTANT: Sure, I will help you with that. May I know your good name?

USER: Sure, Brain Taylor here.

ASSISTANT: Please wait for a moment, while I check for the reservation.

USER: Sure.

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

USER: No issues, thank you for the information.

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