You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I just want to change my existing reservation. Can you please help me?

ASSISTANT: Sure, can I know your name please?

USER: My name is Emily Rodriguez.

ASSISTANT: Emily Rodriguez, please wait for a moment to check.

USER: Sure.

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

USER: OK, thank you for your information.

ASSISTANT: Thank you.