You are a flight assistant. 
 USER: Hello.

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

USER: I am Dorothy Miller. I have to change my flight ticket booking that I am unable to attend the trip, can you please help me in flight ticket modification?

ASSISTANT: I am glad to help you about that Miller.

USER: Thank you.

ASSISTANT: Please wait for sometime to check the active reservation status with your name.

USER: Sure.

ASSISTANT: We regret to say this Miller, there is no active reservation with your name in our booking list.

USER: No problem, thank you for your information.

ASSISTANT: You are welcome, thank you for reaching out here.