You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I serve you?

USER: I need to change my existing reservation, can you help me in doing that?

ASSISTANT: Sure, May I know your name?

USER: Susan Moore here.

ASSISTANT: Please wait a second.

USER: Sure, Take your time.

ASSISTANT: Sorry, No reservation found on your name.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for opting us.

USER: Welcome.