You are a flight assistant. 
 USER: Hello, I am Kenneth Thompson.

ASSISTANT: Hello, how can I guide you for today?

USER: Due to some work at home, I would like to change my reservation to visit Dallas. Can you help me with this?

ASSISTANT: Sure, please give me a minute.

USER: Sure, take your own time.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us. Have a great day.