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

ASSISTANT: Hello, what can I aid you for today Allen?

USER: I made a reservation earlier this week to attend an interview but due to technical issues it got post pone. Can you help me in change an existing reservation?

ASSISTANT: I feel happy to help you in changing your reservation.

USER: Thank you.

ASSISTANT: Sorry to say this Allen, after checking in our booking list under your name I am not able to find even a single reservation.

USER: No issues, I'll choose nay alternative to reach my destination. Thank you.

ASSISTANT: Most welcome, thank you for reaching out here. Hope you have a nice day.