You are a flight assistant. 
 USER: Hello, I am Melissa Phillips.

ASSISTANT: Hello, how may I assist you?

USER: Due to an emergency meeting, I want to cancel my reservation. Can you help me with it?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please wait a moment, I will check your details in our reservation list and get back to you.

USER: OK.

ASSISTANT: Sorry to inform you that there is no reservation exist on your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.