You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am Charles Davis.

ASSISTANT: Nice to meet you Charles.

USER: I like to cancel my reservation due to some problems, can you help me with that ?

ASSISTANT: Sure, I will help you Charles. Just give me a moment, I will check is there any previous reservation available or not on your name.

USER: Ok.

ASSISTANT: Your reservation has been successfully cancelled.

USER: Thank you, for helping me.

ASSISTANT: You are welcome.