You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Owing an emergency, I want to cancel my reservation. Can you help me for that?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name?

USER: My name is Melissa King.

ASSISTANT: I found your reservation and cancelled it successfully.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.