You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I address you?

USER: Can you please help me to change my existing reservation?

ASSISTANT: Sure, will you please let me know your name?

USER: I am Deborah Campbell.

ASSISTANT: Ok, let me check the current status and revert you.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no reservation found active under your name in our data base.

USER: It's ok, thank you.

ASSISTANT: Thank you for opting us.