You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Can you change my reservation please?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: May I know your good name?

USER: I am Joseph Baker.

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

USER: Sure, take your time.

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

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for visiting us.