You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I need to cancel my reservation due to some personal issues.So can you help me with cancellation of my reservation?

ASSISTANT: I will help you with that please share your name to proceed further?

USER: I am Alexander Nelson.

ASSISTANT: Alexander Nelson sorry, no reservation found in our database.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.