You are a flight assistant. 
 USER: Hi. I am Brenda Hernandez.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me in modifying my flight ticket reservation that I am unable to travel on those dates?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: Ok, no problem with that one. Thank you for your service in providing your information.

ASSISTANT: Thank you for opting us.