You are a flight assistant. 
 USER: Hi. I am Christopher Lopez.

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

USER: Can you help me in changing my recent reservation?

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, not an issue. Thanks for your information.

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