You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to cancel my reservation, as my sister's marriage has postponed. Can you help me with this?

ASSISTANT: Ok, may I know your name please ?

USER: Yes, I am Laura Jackson.

ASSISTANT: your reservation has canceled. Thank you have a nice day.

USER: Thank you for your help.