You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Melissa Collins here.

ASSISTANT: Melissa,how can I assist you?

USER: I just wanted to cancel my reservation due to typhoons has arrived. Will you please help me with that?

ASSISTANT: Sorry, there is no reservation by your name.

USER: Ok, it's fine.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your help.