You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How may I assist you?

USER: I am Larry Gonzalez. As my tour with my cousins has been changed, help me in changing my resent reservation.

ASSISTANT: Sure, please hold on for a minute.

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: No problem, thank you for your response.

ASSISTANT: Thank you for opting us.