You are a flight assistant. 
 USER: Hello. I am Margaret Wright.

ASSISTANT: Hello Margaret, how may I help you today?

USER: My previous reservation has been done with wrong dates, can you help me in cancelling my reservation?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Sorry Margaret, there is no reservation with your name in our records to cancel.

USER: It's ok. Anyway, thank you for your help.

ASSISTANT: You are welcome.