You are a flight assistant. 
 USER: Hello, I am Debra Turner.

ASSISTANT: Hello, how may I assist you?

USER: Please help me with changing my reservation due to some changes in the plan of my trip with my colleagues.

ASSISTANT: Sure, I am here to help you. Hold on for a moment. Let me check.

USER: Thank you.

ASSISTANT: Sorry Turner, there are no flights reserved on your given name.

USER: Take your time. No issues. Thank you for checking.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.

USER: You are welcome.