You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I need to cancel the existing reservation because I am unable to travel due to some health issues. Can you please help me?

ASSISTANT: Sure, may I know your name so that I will check your reservation details in our data base?

USER: Thank you for accepting my request. My name is Patrick Turner.

ASSISTANT: Ok, please wait for a while.

USER: Ok, take your time.

ASSISTANT: Sorry Patrick Turner, we couldn't found any reservation in our database.

USER: It's ok, I think the ticket is not confirmed. Anyways thank you for your help.

ASSISTANT: Thank you.

USER: You are welcome.