You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I want to change my recent reservation. Can you help me out?

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

USER: Andrew Thompson.

ASSISTANT: Ok, please wait a moment.

USER: Ok, take your time.

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 ok. Anyways, thank you.

ASSISTANT: Thank you for choosing us.