You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you for today?

USER: I am David Gonzalez and I have to some changes in my flight ticket that there is an important appointment with the central minister about the elections, can you help in changing my flight ticket?

ASSISTANT: Sure, I am here to help you about that.

USER: That's great, thank you.

ASSISTANT: Sorry David, there is no previous reservations under your name to change.

USER: Ok, that's fine, I can check it later, thanks for your information.

ASSISTANT: It's my pleasure, thank you for reaching out here.