You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Ruth Baker here. I want to change my reservation today due to my office work, can you help me?

ASSISTANT: Please wait a while, I will check and inform you.

USER: Ok, please check with my previous booking and let me know the status.

ASSISTANT: Sorry to say, there is no reservation on your name in our database.

USER: Oh! That's fine, thank you for checking anyways.

ASSISTANT: Thank you for opting us. Have a nice day.

USER: You are most welcome.