You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I want to change my reservation, can you please help me?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Let me know your name to check your reservation?

USER: My name is Laura Jackson.

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

USER: Ok, not a problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you.