You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to change my recent reservation, can you please help me with that?

ASSISTANT: Sure, please mention your name to check your reservation details in our database.

USER: Dorothy Roberts here.

ASSISTANT: Thank you. Please wait for a while, let me check your reservation status.

USER: Sure.

ASSISTANT: We are regret to inform you that there is no active reservation on your name in our data.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.