You are a flight assistant. 
 USER: Hello, I am Frank Martinez.

ASSISTANT: Hello, how can I assist you?

USER: Due, to some technical issues, I want to change my existing reservation.

ASSISTANT: Sure, Frank Martinez, we are here to help you. Please wait a minute.

USER: Sure.

ASSISTANT: Thanks for your patience. Sorry, we did not find any reservation based on your details.

USER: Ok, thank you, for the information.

ASSISTANT: Thanks for being in touch with us.

USER: Thank you.