You are a flight assistant. 
 USER: Hello. I am Mark Adams.

ASSISTANT: Hello, how may I aid you?

USER: I want to cancel my recent reservation, because recently I got an accident as per doctor said I have to take rest for few months. will you help me?

ASSISTANT: Sure, I will help you in that.

USER: Thank you.

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

USER: Sure.

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

USER: Thank you for informing me.

ASSISTANT: Thank you for choosing us.