You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Actually my Java exam is postponed so that I want to cancel my recent reservation, can you help me?

ASSISTANT: Sure, can you tell me your good name please?

USER: Sure, I am Lisa Collins.

ASSISTANT: Sorry to inform you Lisa, there is no reservation with your name in our database. Thank you for reaching us.

USER: OK, thank you for your help.

ASSISTANT: You are welcome.