You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Charles Hall.

ASSISTANT: How can I aid you?

USER: Due to some meetings, I want to cancel my recent reservation. Can you please help me to cancel my reservation?

ASSISTANT: Sure, I will help you with that.

USER: Ok.

ASSISTANT: Charles Hall, I didn't find any reservation under your name in our database.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you very much for helping me.