You are a flight assistant. 
 USER: Hello. Debra Phillips here.

ASSISTANT: Hello, how can I help you today?

USER: I want to change my current reservation today as I got an appointment with a famous doctor. Can you help me?

ASSISTANT: Sure, please wait for a while.

USER: Ok, I will be waiting for your response.

ASSISTANT: Thanks for waiting, there is no active reservation on your given name.

USER: Oh! That's fine. Thank you for checking anyways.

ASSISTANT: Thank you for opting us.

USER: Most welcome.