You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I already book a reservation to Dallas now I want to change my dates. Can you change my reservation with new dates?

ASSISTANT: Sure, I will help you with that. May I know your good name please?

USER: My name is Pamela Miller.

ASSISTANT: Please give me a minute, I will check with status and revert to you.

USER: Ok.

ASSISTANT: Thanks for being patient, there is no active reservation found on your name.

USER: Ok, thank you for the information.

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