You are a flight assistant. 
 USER: Hi. I'm Jessica Lopez.

ASSISTANT: Hello, how may I be helping hand to you?

USER: I have to participate in science fest which will held at New York. Can you please book a ticket with a price limit of 500? I need single connection.

ASSISTANT: Sure, may I have your dates of travel?

USER: My depart and return dates are 10/23 and 10/25.

ASSISTANT: Can you please provide your airport codes?

USER: I would like to board at Houston, TX - HOU and land at NY - JFK.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: Sorry, there were no flights available on your preferable dates.

USER: Ok, no issue. Thanks for your support.

ASSISTANT: Thank you for contacting us.