You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, please provide me your name.

USER: I am Elizabeth Moore.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: We didn't find any reservation on your name to proceed.

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

ASSISTANT: Thank you.