You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Kenneth Martinez.

ASSISTANT: How can I assist you?

USER:  I want to change my travel dates, due to some health problems I am unable to travel those dates, can you please change my reservation?

ASSISTANT: Sure Kenneth, please wait a moment.

USER: Sure.

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

USER: That's ok, thank you.

ASSISTANT: Thank you for approaching us.