You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jonathan Martinez.

ASSISTANT: How may I assist you?

USER: I want to cancel my ticket, can you please help me?

ASSISTANT: Sure, I will help you. Please wait a moment. Jonathan Martinez, no reservation has been found on your name in our database.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.