You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Owing to an emergency, I need to cancel my recent reservation. Can you please help me with that?

ASSISTANT: Sure, let me check your reservation details in our database.

USER: Ok, I am Joseph Williams.

ASSISTANT:  Joseph Williams, I did not find any reservation by your name in our database.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.