You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I want to change my existing reservation owing to an emergency.

ASSISTANT: Sure, will you mention your name please?

USER: My name is Edward Anderson.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: There is no reservation found under your name.

USER: Thank you.

ASSISTANT: Welcome, have a great day.