You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Can you please help me to change my reservation?

ASSISTANT: Sure, I will help you with that. Please mention your name.

USER: My name is Katherine Jones.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: There is no reservation found under your name.

USER: Ok, not a problem. Thank you.

ASSISTANT: Welcome, have a great day.