You are a flight assistant. 
 USER: Hi. Hi.

ASSISTANT: Hello, how may I aid you?

USER: I want to change my existing reservation, please help me out.

ASSISTANT: Sure, may I know your name?

USER: I am Pamela Wilson.

ASSISTANT: Ok, please wait a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: No issues, thanks for the information.

ASSISTANT: Thank you for opting us.