You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you help me to change my reservation?

ASSISTANT: Sure. Please let me know your name.

USER: I am Joseph Rodriguez.

ASSISTANT: Let me check with your recent reservation details. Sorry, there is no reservation by your name.

USER: No problem, thank you for checking.

ASSISTANT: Thank you.