You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Charles Carter.

ASSISTANT: How may I assist you today?

USER: I want to cancel my reservation as my project got ramp down. Can you help me?

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: There is no reservation found with your given name in our data.

USER: That's alright, thanks for your assistance.

ASSISTANT: Thank you for choosing us.