You are a flight assistant. 
 USER: Hello, I am Mary Martin.

ASSISTANT: Hello, how may I serve you today?

USER: Owing to emergency I need to cancel my reservation, can you please help me in cancelling?

ASSISTANT: Sure, I am here to help you. Please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Ok, thank you.

ASSISTANT: Thank you for reaching us.