You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

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

ASSISTANT: Yes, can you share me your name for checking?

USER: My name is Samantha Garcia.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: Thank you.

ASSISTANT: Thank you for reaching us.