You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am Helen Roberts, want to cancel my trip due to some personal reason. Can you please help me?

ASSISTANT: Sure, can you please provide me with your dates of travel? Ok, please wait for a moment.

USER: Sure, take your time.

ASSISTANT: Sorry Helen, there is no reservation found as per your name.

USER: That's fine, thank you.

ASSISTANT: You are welcome.