You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Helen Lopez.

ASSISTANT: Helen Lopez, how can I aid you today?

USER: I want to attend the Culture, heritage and folk festivals as a chief guest in Chicago, ORD. Can you help me to book a connecting flight?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your travelling dates please?

USER: My travelling dates are May 31 and June 02.

ASSISTANT: Ok, can you please provide your source airport code?

USER: My source is from Houston, HOU.

ASSISTANT: Ok, do you have any specifications?

USER: I need an economy class flight.

ASSISTANT: Ok, hold on for a moment. Let me check the best available flight for you.

USER: Sure, I will wait, but I want to depart in the afternoon time and return in the evening time.

ASSISTANT: Sorry Helen Lopez, there are no flights available on your requested dates.

USER: Ok, thank you.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.