You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, do you need any help from us?

USER: I am Sandra Smith. I need to cancel my reservation, can you help me out?

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: Sorry, there is no reservation matching with your name in our portal to cancel.

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

ASSISTANT: You are welcome.