You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello,how can I assist you?

USER: I am Melissa Williams . Could you please help me in cancelling my recent reservation .

ASSISTANT: Sure Melissa, please wait for a moment to check it.

USER: Sure .

ASSISTANT: I will revert you back. OK Melissa thank you being on hold.Sorry,based on your requested name I could not find any reservation.

USER: OK thank you very much for your information.

ASSISTANT: OK Melissa ,thank you for contacting us.