You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be at your service?

USER: Can you help me in changing my existing reservation?

ASSISTANT: Sure, may I know the name on which you have booked the tickets?

USER: I am Ruth Carter.

ASSISTANT: Thank you, please wait while I fetch your existing reservation.

USER: Sure.

ASSISTANT: We don't see any reservation on the name of Ruth Carter in our records.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.