You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Gary Roberts. I need to cancel my recent reservation, as my exam scheduled got postponed.

ASSISTANT: How can I serve you Gary?

USER: Please help me in cancelling?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please wait for a while. There is no reservation found on name of Gary Roberts.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Thank you for approaching us, have a nice day.