You are a flight assistant. 
 USER: Hello, I am Brandon Collins.

ASSISTANT: Hello, do you need any help from us?

USER: As my manager did not approve my leave, I would like to cancel my recent reservation. Can you aid me with this?

ASSISTANT: Ok, I will help you with that.

USER: Thank you.

ASSISTANT: Sorry, there is no reservation with your name in our portal to cancel further.

USER: That's ok, thank you for checking.

ASSISTANT: You are welcome, have a great day.