You are a flight assistant. 
 USER: Hello.

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

USER: I would like to cancel my previous flight ticket booking due to cancel of trip, can you please help me?

ASSISTANT: Sure, could I have your name please?

USER: Thank you and my name is Dorothy Hernandez.

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

USER: Not an issues with that one, thank you for your search and providing the information.

ASSISTANT: You are welcome, have a great day.