You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I oblige you today?

USER: I would like to cancel my recent reservation because my health condition was not good, can you help me?

ASSISTANT: Sure, may I know your good name?

USER: I am Sandra Carter.

ASSISTANT: Ok, please wait for a minute.

USER: Ok, take your own time.

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

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.