You are a flight assistant. 
 USER: Hello.

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

USER: Myself Christopher Martinez. For some issues I want to change my reservation, can you please help me?

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

USER: Sure.

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

USER: It's ok. Thank you for the information.

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