You are a flight assistant. 
 USER: Hello, I am David Harris.

ASSISTANT: Hello, How can I help you?

USER: I want to attend Arts and Crafts Festival with my friends at Houston, TX - IAH. Can you book a ticket from Houston, TX - HOU?

ASSISTANT: Sure, Please help me with your travel dates.

USER: I will depart on 09/24 and return on 09/26.

ASSISTANT: Please wait a second.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, no issues. Thanks for your service.

ASSISTANT: Thank you for reaching us.