You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, I am glad to help you with that. Can you please share me your name?

USER: Sure, my name is Brian Robinson.

ASSISTANT: Please wait a moment.

USER: Sure, I'll be online.

ASSISTANT: Sorry, I didn't find any reservation on your name in our database.

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

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