You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: My name is Patricia Taylor. I want to visit my home town Houston - IAH, can you please book a flight ticket from EWR?

ASSISTANT: Sure, may I know your planned travel dates?

USER: I will travel on Mar 19th and 21st.

ASSISTANT: Do you have any specifications?

USER: I want to depart in the morning. I am looking for a direct flight.

ASSISTANT: Do you have any other specifications?

USER: No, I don't have.

ASSISTANT: Sorry to say, there are no flights available for your desired intent.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.