You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I serve you?

USER: I want to cancel my recent reservation as my plan to meet my grand parents got postpone due to my health issues. Can you help me?

ASSISTANT: Sure, We are here to help you.

USER: Thank you.

ASSISTANT: May I know your name?

USER: Jack Roberts here.

ASSISTANT: Give me a minute.

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: That's ok, thank you for checking.

ASSISTANT: Thank you for approaching  us.