You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: Can you help me in changing my recent reservation, as my exam is postponed?

ASSISTANT: Sure, I will help you with that.

USER: Ok.

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

USER: I am Patricia Carter.

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

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us.