You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sandra Williams.

ASSISTANT: How may I aid you?

USER: I have some impotent meeting so I want to cancel my resent reservation, can you please help me in that?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

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

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.