You are a flight assistant. 
 USER: Hello,. I am Betty Roberts.

ASSISTANT: Hello, how may I help you?

USER: I want to change my existing reservation as my joining date got rescheduled in an organisation. Please help me out.

ASSISTANT: Sure, please wait for a minute.

USER: Ok.

ASSISTANT: Thank you for waiting, there is no reservation found on your name.

USER: No issues, thank you.

ASSISTANT: Thank you for reaching us.