You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: Can you change my reservation?

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

USER: Myself Samuel Hernandez.

ASSISTANT: Please give me a moment.

USER: sure.

ASSISTANT: Thank you for waiting, there is no reservation found under your name.

USER: It's ok. Thank you.

ASSISTANT: Welcome, have a great day.