You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Donna Anderson.

ASSISTANT: How can I help you?

USER: Owing to an emergency, I want to cancel my recent reservation. Please help me.

ASSISTANT: Sure, I will help you. Please wait a moment.

USER: Ok.

ASSISTANT: No reservation found on your name Donna Anderson.

USER: It's ok. Thank you for your time.

ASSISTANT: Thank you for contacting us.