You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am Debra Johnson, want to change my reservation. Can you please help me?

ASSISTANT: Sure, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there are no active reservations found on your given name.

USER: That's fine, thank you.

ASSISTANT: Thank you for choosing our service.