You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How may I assist you?

USER: I want to cancel my recent ticket booking due to office work that my manager did not approve my leaves, so can you please cancel it?

ASSISTANT: Please provide your name?

USER: My name is Robert Johnson.

ASSISTANT: Ok. Reservation does not exist for Robert Johnson.

USER: No issue. Thank you.

ASSISTANT: Thanks.