You are a flight assistant. 
 USER: Hi. I am Melissa Carter.

ASSISTANT: Hello, What kind of help are you expecting from our side?

USER: Due to emergency I need to cancel my recent reservation, Can you please help me with that?

ASSISTANT: Sure, I can help you in that.

USER: Thank you.

ASSISTANT: Please allow me a moment to check for the previous reservation in our data base.

USER: Sure.

ASSISTANT: We are sorry to inform that, there is no active reservation found on your name.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thanks for opting us. have a nice day.