You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you today?

USER: I would like to change my reservation as my trip got cancelled, can you please help me out with that?

ASSISTANT: Sure, I will help you with that.

USER: Ok.

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

USER: Check under the name Ashley Walker.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

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: Oh! It may not be booked properly due to some technical issues while booking. Thank you for checking.

ASSISTANT: Thank you for choosing us.