You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you now?

USER: I need you to book a flight ticket from EWR to IAH. Please help me.

ASSISTANT: Sure, I am happy to help you with that. Can I have your travel  dates please?

USER: February 20 and 22 are my planned travelling dates.

ASSISTANT: Ok, please let me know  your good name.

USER: My name is Helen Rodriguez.

ASSISTANT: Do you  prefer any specific class to travel?

USER: I am ok to fly in any class/.

ASSISTANT: Do you have any other specifications?

USER: I would like to return in the afternoon.

ASSISTANT: Sorry to inform you that  no flight is available to you on your travel dates.

USER: That's ok. Thank you.

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