You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Helen Lewis here.

ASSISTANT: How can I serve you?

USER: I want to cancel my recent reservation due to board exams. Can you help me in this one?

ASSISTANT: Sure, We are here to assist you. Please wait a while.

USER: Sure.

ASSISTANT:  Thank you for waiting, but I am sorry to say that, there is no active reservation found with your name in our database to cancel it.

USER:  Oh! That's ok, thank you for giving the information.

ASSISTANT: Thank you for approaching  us.