You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Melissa Collins here. Due to inconvenience of my work, I want to cancel my reservation. Can you please help me for that?

ASSISTANT: That is my job surely I will assist you, can you wait a moment?

USER: Ok, I will wait for your response.

ASSISTANT: Thank you for waiting, there is no flight ticket been reserved by your name. So, I can not cancel the reservation.

USER: Anyway, thanks for the information.