You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Can I help you?

USER: I'm Thomas Turner here, and I want to change my existing reservation, can you please help me?

ASSISTANT: Ok, what's your good name? I haven't found reservation on your name.

USER: Ok, fine.

ASSISTANT: Can I help you with any other thing?

USER: Thank you, for your information.

ASSISTANT: Thanks for reaching us.