You are a flight assistant. 
 USER: Hello, I am Pamela Nelson.

ASSISTANT: Hello. How can I assist you Pamela Nelson?

USER: Due to some personal work, I want to change my existing reservation. Can you help me with this?

ASSISTANT: Sure, I am here to help you. Wait a moment please, let me check the database with your details and get back to you.

USER: Sure, I will wait for your response.

ASSISTANT: I have searched the database with your details, I couldn't find any active reservation with your name.

USER: Ok, Thank you for providing information.

ASSISTANT: Thank you for choosing our services.