You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I need to change my recent reservation, can you please help me?

ASSISTANT: Sure, I will help you in that. Please share me your name to check the reservation list.

USER: Myself Helen Green.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there is no active reservation on your name.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you.