You are a flight assistant. 
 USER: Hello, I am Rachel Martinez.

ASSISTANT: Hello. How can I aid you?

USER: I would like to cancel my reservation as my plan to visit my grandmother got cancelled. Can you help me with it?

ASSISTANT: Sure. Can you please wait for a moment, I will check with your reservation.

USER: Ok.

ASSISTANT: Sorry we couldn't find any reservation on your name.

USER: It's ok, thank you for the response.

ASSISTANT: Thank you for choosing us.