You are a flight assistant. 
 USER: Hello, Emma Smith here.

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

USER: I would like to change my reservation today due to my office work, can you help me?

ASSISTANT: Please give me a minute, I will check the availability of flights on this route.

USER: Ok, please inform me my previous booking status.

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

USER: Ok, that's fine, thank you for checking anyways.

ASSISTANT: Thank you for contacting us, have a nice day.

USER: You are welcome.