You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Gregory Martin from Houston. I want to change my travel dates in my previous reservation. Can you please help me with that?

ASSISTANT: Ok, wait a moment I will check the records.

USER: Ok, thank you.

ASSISTANT: There is no reservation been found on your name to check.

USER: Oh! It's ok no problem. Thank you for your information.

ASSISTANT: So, I can not change the reservation. Sorry for the inconveniences.

USER: It's ok.

ASSISTANT: Thank you for connecting with our agency.