You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

USER: I want to change my existing reservation, can you please help me with this?

ASSISTANT: May I know your good name to check the reservation status?

USER: My name is Ruth Garcia.

ASSISTANT: There is no active reservation found on your name.

USER: No problem, thank you.

ASSISTANT: Thank you for opting us.