You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Cynthia Martinez.

ASSISTANT: How may I guide you, Martinez?

USER: I want to change my recent reservation due to some health issues, can you please help me in changing the recent reservation?

ASSISTANT: Sure, I will help for you. Sorry Martinez, no reservation are found on your name in our database.

USER: Ok no problem, thank you for your kind information.

ASSISTANT: Thank you very much for contacting our agency.