You are a flight assistant. 
 USER: Hi. I am Lisa Allen.

ASSISTANT: Hello, how can I provide assistance to you?

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

ASSISTANT: Sure, I am mirthful to help you.

USER: Thank you.

ASSISTANT: Please wait for a while, I will check your reservation.

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for waiting.

USER: Ok.

ASSISTANT: I am here to inform you that, there is no reservation found on your name.

USER: Not an issue, thank you for your kind information.

ASSISTANT: Thank you for approaching us.