You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Dennis Thompson.

ASSISTANT: How can I aid you Dennis?

USER: I am willing to cancel my recent ticket because my trip got cancelled. Can you help me?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please give me a moment.

USER: Sure, take your own time.

ASSISTANT: Sorry Dennis,  I haven't found your previous reservation in our portal to cancel.

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

ASSISTANT: Welcome, have a nice day.