You are a flight assistant. 
 USER: Hi, I am Charles Collins.

ASSISTANT: Hello. How can I assist you?

USER: Due to heavy rainfall I want to cancel my reservation, can you please cancel my ticket?

ASSISTANT: Sure, please wait a minute.

USER: Ok.

ASSISTANT: Thanks for your time, we have not found any reservation with your name.

USER: Ok, thanks for your response.

ASSISTANT: Thank you for opting us.