You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I guide you for today?

USER: I am Samantha Miller, can you help me to change my reservation?

ASSISTANT: I will help you with that. Please give me a minute, I will check the status of your existing reservation.

USER: Sure, please wait for a moment. Please check my details.

ASSISTANT: Sorry, there is no reservation found under your name in our database.

USER: No issues, thank you for your time.

ASSISTANT: Thank you for contacting us, have a nice day.