You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER: I am Elizabeth King. I want to change my existing reservation as my destination airport has been changed.

ASSISTANT: Ok.

USER: Will you help me in changing my reservation?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

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: Ok. Thank you for sharing the information.

ASSISTANT: Thank you for reaching us.