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

ASSISTANT: Hello, what can I do for you?

USER: I want to attend Fairy and Earth Month  Celebrations  Festival in Houston,IAH. Please book a direct flight ticket.

ASSISTANT: Sure, Let me know your source airport code.

USER: My source code is LGA.

ASSISTANT: Could you please mention your travelling dates?

USER: My travelling dates are from 06/05 to 06/07.

ASSISTANT: Ok, give me a minute.

USER: Ok.

ASSISTANT: There are no flights found according to your requirements.

USER: No problem, thank you for the response.

ASSISTANT: Thank you for picking us.