You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jason Perez.

ASSISTANT: How may I help you?

USER: I am trying to change my existing reservation, due to an emergency but it is not happening, can you help me with this?

ASSISTANT: Sure, I will help you Jason. Sorry, there is no reservation has been found on your name in our database.

USER: Oh! It's ok, no issue.

ASSISTANT: Thank you for utilizing our services.

USER: You are welcome.