You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you please help me in changing my recent reservation? As my planned trip has been postponed to some other dates.

ASSISTANT: Sure, I will help you to change your reservation.

USER: Thanks for that.

ASSISTANT: Ok, may I know your name?

USER: Sure, my name is Anthony Smith.

ASSISTANT: Sorry, no reservation found on your name to change your reservation.

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

ASSISTANT: Welcome, have a nice day.