You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I assist you?

USER: I just want to change my reservation as my exam got postponed. Can you help me with it?

ASSISTANT: Sure, please mention your name to proceed.

USER: I am Emily Lewis.

ASSISTANT: Ok, please wait for a minute.

USER: Ok.

ASSISTANT: Thank you for waiting. I have checked in reservation list to change your ticket, but could not find any reservation with your name.

USER: That's fine, thank you.

ASSISTANT: Thank you for availing us regarding changing process.