You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you now?

USER: Steven Baker here. I would like to book a ticket from EWR to IAH, can you help me with that?

ASSISTANT: Sure Steven Baker, I will help you with that. Can I have your travel dates please?

USER: The travel dates are from 12/20 to 12/22.

ASSISTANT: Ok, please be hold on for a moment.

USER: Ok.

ASSISTANT: Sorry Steven Baker, no flight is available to you on your dates.

USER: That's fine.

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

USER: Thank you for your service.