You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Brian Turner here. Can you please book a flight IAH to SEA?

ASSISTANT: Sure, let me know your travelling dates.

USER: My journey dates are from Aug 1st to Aug 3rd.

ASSISTANT: Please share your specifications.

USER: I need a direct flight only.

ASSISTANT: Is there any specifications?

USER: No, thank you for asking.

ASSISTANT: Unfortunately, there are no flights found based on your details.

USER: Oh! That's fine. Thank you for checking.

ASSISTANT: Thank you for choosing us.