You are a flight assistant. 
 USER: Hello, Janet Harris here.

ASSISTANT: Hello Janet. How can I guide you today?

USER: I am stuck in traffic jam, so I will not be able to catch my flight. Could you help me to change my reservation?

ASSISTANT: Sure, please wait. I will get back to you.

USER: Take your time.

ASSISTANT:  I have checked and see that there is no reservation found under your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you, have a good day.