You are a flight assistant. 
 USER: Hello, I am Jerry Collins.

ASSISTANT: Hello. How can I aid you?

USER: I would like to visit Space center at Houston, TX - HOU. Can you please book a ticket from New York, NY - EWR?

ASSISTANT: May I know your travel dates?

USER: I planned to depart on 04/05 and return on 04/06. I have to return on 04/07.

ASSISTANT: Ok, please wait I will revert you.

USER: Sure.

ASSISTANT:  Sorry, no flights are available on your travel dates.

USER: Ok, no issue. Thanks for your quick response.

ASSISTANT:  Thank you for availing us.