You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Catherine Jones.

ASSISTANT: How may I serve you today?

USER: Due to sudden changes in my journey, I need some help in changing my previous reservation. Can you please help me with changing?

ASSISTANT: Sure, I'll help you with this.

USER: Thank you for accepting my request.

ASSISTANT: Please wait a moment I will check the reservation list.

USER: Sure, I can wait for your response.

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 with that one, thank you for checking and providing the information in quick manner.

ASSISTANT: Thank you for opting us.