You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I guide you today?

USER: I would like to change my reservation as my exams cancelled, can you please help me out with that?

ASSISTANT: Sure, I am glad to help you in changing your reservation. Can you please share me your good name to check your reservation status?

USER: Thank you. Myself Lisa Thomas.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: Sorry to inform you that, we have not found any active reservation on your name in our records.

USER: Ok, no problem. Anyway thank you for checking out.

ASSISTANT: Thank you for reaching us.