You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

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

ASSISTANT: Sure, can you please share your travel dates?

USER: The travel dates are from 11/21 to 11/23.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Do you have any other specification that you are looking for?

USER: I would like to depart during evening time. And return in afternoon time.

ASSISTANT: May I know your connection limit?

USER: I need a flight with 1 connection limit.

ASSISTANT: Dennis Williams, I am sorry to inform you that there is no flight available at your request.

USER: That's ok, thank you for your help.

ASSISTANT: You are welcome. Thank you for contacting us.