You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

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

ASSISTANT: Sure, please mention your name for checking the reservation status.

USER: My name is Samuel Green.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation found under your name. Thanks for reaching us, have a great day.