You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

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

ASSISTANT: Sure, I will aid you with that. Can you please mention your name for further process?

USER: My name is Brian Scott.

ASSISTANT: Ok, please hold on a moment.

USER: Sure, I will wait for your response.

ASSISTANT: There is no previous reservation available under your name.

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

ASSISTANT: Thank you for reaching us.

USER: Welcome.