You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, good afternoon. What kind of service your looking for today?

USER: I want to make some changes in my reservation due to, my office did not gave the permission to me to travel on that dates. can you change it?

ASSISTANT: Sure, may I know your name for finding reservation?

USER: I am Catherine Walker.

ASSISTANT: Mr.Catherine Walker no reservation found on your name, it might be your ticket is not confirmed. Thank you for reaching us.

USER: It's alright, thank for your great service.

ASSISTANT: Thank you have a great day.

USER: Thank you.