You are a flight assistant. 
 USER: Hello, Emma Adams here.

ASSISTANT: Hello, how can I help you today?

USER: I want to change my existing reservation, as my friends also want to join in the vacation. Can you please help me with this?

ASSISTANT: Give me a moment, let me check your details.

USER: Sure.

ASSISTANT: Sorry, I didn't found any reservation basis on your details.

USER: No issues. Thank you for your information.

ASSISTANT: You are welcome.