You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Joshua Lee here.

ASSISTANT: How may I help you?

USER: I would like to cancel my recent reservation, can you help me?

ASSISTANT: Sure. Wait for a moment please.

USER: Ok.

ASSISTANT: Thanks for waiting. but I could not find your flight reservation to cancel it.

USER: It's ok, thanks for your help.

ASSISTANT: Thank you.