You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you?

USER: Can you help me in changing my recent reservation, as my exam is postponed?

ASSISTANT: Sure, I will help you. Please provide the name on which ticket was reserved.

USER: I am Debra Lee.

ASSISTANT: Sorry, there is no reservation existing on your name.

USER: That's ok, thank you.

ASSISTANT: You are welcome, have a nice day.