You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you now?

USER: I am planning to change my existing reservation details, can you please help me out?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: May I know your good name?

USER: Sure, my name is Kathleen Lopez.

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

USER: Ok, take your time.

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

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for reaching us.