You are a flight assistant. 
 USER: Hi, I am Barbara Martin.

ASSISTANT: Hello, how could I aid you today?

USER: Owing to an emergency, my planned trip to Yosemite adventure has been cancelled. So I want you to cancel my existing reservation?

ASSISTANT: Sure, we are grateful to help you. Please wait for a few minutes.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry to say that, no reservation was found on your good name in our database.

USER: Ok, no worries at all. Thank you for your help.

ASSISTANT: Thank you for visiting us.