You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you for this moment?

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

ASSISTANT: Sure David, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for a mean while.

USER: Sure, I will wait.

ASSISTANT: Your reservation has been successfully cancelled as per your name.

USER: Thank you.

ASSISTANT: You are welcome and have a great day.