You are a flight assistant. 
 USER: Hello, Mary Campbell here.

ASSISTANT: Hello, how may I help you?

USER: Owing an emergency, I want to cancel my recent reservation.

ASSISTANT: Yes, Mary.

USER: Can you please help me?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Can you give me a moment to check the previous reservation on your name in our data base.

USER: Ok, take your own time.

ASSISTANT: Sorry Mary, there is no previous reservation found on your name.I guess the previous booking is not done properly.

USER: Thank you for your valuable information.

ASSISTANT: Thank you for reaching us.

USER: Welcome.