You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you today?

USER: I am Debra Davis. My exams got postponed, can you please help me in changing the reservation?

ASSISTANT: Sure, I am here to help you with that reservation changing.

USER: Thank you.

ASSISTANT: Sorry to tell you that, there is no active reservation found with your name in our reservation list to change it.

USER: No issues, thank you for your information.

ASSISTANT: Thank you for reaching us, have a great day.