You are a flight assistant. 
 USER: Hi, I am Frank Rodriguez.

ASSISTANT: Hello, what can I do for you today?

USER: I made a reservation earlier this week to give a seminar but due to some technical issues I need to change an existing reservation. Can you help me in changing an existing reservation?

ASSISTANT: Sure, please wait a while. I will check and get back to you.

USER: Ok.

ASSISTANT: Thank you for being wait. Unfortunately there is no reservation found matching your name.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for consulting us.