You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Kenneth Hernandez here.

ASSISTANT: How may I help you at this moment?

USER: I would like to change my existing reservation, which is done recently. Can you please help me out?

ASSISTANT: Sure, I am blissful help you with that.

USER: Thank you for considering my request.

ASSISTANT: Ok, wait for a minute.

USER: Sure, I will wait for your response.

ASSISTANT: We are regret to inform you that, there is no reservation found in your name in our database.

USER: Not a big problem, anyway thank you for the information.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your  service.