You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I already book a reservation but due to some reason I want to postponed my trip dates. Can you change my reservation?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: May I know your good name please to proceed further?

USER: My name is Linda Robinson.

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

USER: Ok, I will wait for your reply.

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

USER: Ok, thank you for the information.

ASSISTANT: Thanks for approaching us, have a nice day.