You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: My name is Raymond Garcia. I want to do some changes in my existing reservation. Can you help me for that?

ASSISTANT: Sure, wait a minute.

USER: Sure, I will wait for your response.

ASSISTANT: No reservation found on your name.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.

USER: Welcome.