You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Robert Hernandez. I planned to attend for a meeting in IAH, can you please help me to book a flight ticket from EWR?

ASSISTANT: May I know your desired travel dates please?

USER: I prefer to travel on Dec 24 and Dec 26.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for opting us.