You are a flight assistant. 
 USER: Hi. I am Sandra Mitchell.

ASSISTANT: Hello, how may I aid you?

USER: I need to cancel my reservation, can you help me out please?

ASSISTANT: Sure, please wait a moment I will check your complete reservation details and proceed further.

USER: Sure, take your own time.

ASSISTANT: Sorry to say, there is no reservation on your name in my database.

USER: That's ok, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us, have a nice day.