You are a flight assistant. 
 USER: Hi. I am Samuel Baker.

ASSISTANT: Hello, how may I assist you today?

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

ASSISTANT: Sure, we are glad to serve you. Please wait for a while, let me check your reservation with us.

USER: Ok.

ASSISTANT: Thanks for your time, unfortunately no reservation found with your name.

USER: Ok, thank you for your service.

ASSISTANT: Thank you for availing us, have a great day ahead.