You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Daniel Perez.

ASSISTANT: How can I help you ?

USER: Can you help me to change my reservation? Because I have some work on that dates.

ASSISTANT: Sure,please wait for sometime, I will revert to you.

USER: Sure.

ASSISTANT: Thanks for waiting, but no flight seat is reserved with your name.

USER: That is fine. Thank you for your time.

ASSISTANT: Thanks for availing us.