You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

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

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: My name is Rachel Walker.

ASSISTANT: Thanks for your name, please wait.

USER: My name is Rachel Walker. Sure, I will wait for your response.

ASSISTANT: Thank you for waiting, no reservation was found on your name to cancel.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.

USER: Welcome.