You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Charles Collins.

ASSISTANT: Nice to meet you.

USER: Can you please cancel my existing reservation?

ASSISTANT: Sure, please give me a moment.

USER: Yes, I will wait for your response.

ASSISTANT: Thanks for waiting, there is no reservation found under your name.

USER: That's ok, thank you for assisting me.

ASSISTANT: Welcome, have a great day.