You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I am Lisa Hill. I want to book a ticket from ATL to IAH, can you help me?

ASSISTANT: Ok, can I have your dates of travel?

USER: My travel dates are 09/25 and 09/27.

ASSISTANT:  Lisa Hill, sorry to inform you there is no flight on your preferable dates.

USER: No problem, thanks for checking.

ASSISTANT: Welcome, have a nice day.