You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Due to inconvenience of my work, I want to change my reservation. Can you please help me for that?

ASSISTANT: Sure, I am glad to help you with your concern. Can you please help me with your name to check with the status?

USER: My name is Michael Thomas.

ASSISTANT: Please wait a moment.

USER: Ok, I will wait.

ASSISTANT: Thank you for waiting.

USER: My pleasure.

ASSISTANT: Michael Thomas, regret to inform that there is no active reservation found in our database to change.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for connecting with us.