You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I assist you?

USER: Myself Edward Gonzalez. I want to change my existing reservation, can u help me?

ASSISTANT: Edward Gonzalez there is no existing reservation on your name.

USER: It's Ok.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your services.

ASSISTANT: It's my pleasure.