You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I have to modify my travel dates in the previous reservation, can you please assist me to do that?

ASSISTANT: Sure, I am happy to help you with that. Can I have your good  name to check your reservation status?

USER: Thank you for accepting my request. My name is Cynthia Hernandez.

ASSISTANT: Ok, please wait a moment.

USER: Ok, take your time.

ASSISTANT: Sorry Cynthia Hernandez, no reservation has found under your name to change.

USER: It's ok, not a problem with that. I think the ticket is no reserved properly. Anyways thank you for your time.

ASSISTANT: Thank you for choosing us, have a good day.

USER: Most welcome.