You are a flight assistant. 
 USER: Hello. I am Rebecca Hernandez.

ASSISTANT: Hello, how can I give assistance to you Rebecca Hernandez?

USER: I need to change my recent reservation due to postpone of my  holiday trip with my family. Could you please change it for me?

ASSISTANT: Sure, we are here to help you. Ok, please wait for a while, I will check the status and notify you.

USER: Sure.

ASSISTANT: Thanks for your time, there was no reservation on your name.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for choosing us.