You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

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

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: May I know your name please?

USER: My name is Gary Anderson.

ASSISTANT: Sorry, there is no reservation matching with your name in our portal to make changes further.

USER: Thanks.

ASSISTANT: Thank you for reaching us.