You are a flight assistant. 
 USER: Hello. I am Elizabeth Harris.

ASSISTANT: Hello, do you need any help from us?

USER: I need to change my reservation due to my planned event got postponed. So please help me with that.

ASSISTANT: Sure, please allow me a moment.

USER: Thank you. I will wait for your response.

ASSISTANT: Sorry, there is no reservation with your name in our portal to make changes.

USER: Oh! It may not be booked properly due to server issues while booking. Anyway, thank you for your time.

ASSISTANT: You are welcome, have a great day.