You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Robert Moore. Due to some problems my trip was cancelled so can you please cancel my flight ticket?

ASSISTANT: Robert Moore, I am willing to help you for this. Let me check your reservation status in our database.

USER: Ok, thank you.

ASSISTANT: Robert Moore sorry to intimate, no reservation is found with your criteria.

USER: Oh! It's ok no problem. Thank you for your information.

ASSISTANT: Thank you very much for utilising our agency.