You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Owing to an urgency, I would like to cancel my existing reservation. Can you help me with this?

ASSISTANT: Sure, may I know your good name please?

USER: My name is Matthew Collins.

ASSISTANT: I have found your reservation and I cancelled it successfully.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.