You are a flight assistant. 
 USER: Hello. I am Paul Thomas.

ASSISTANT: Hello, how may I abet you today?

USER: I wish to go for NASA space center at Houston, HOU. Can you please book a direct flight for me?

ASSISTANT: Sure, we are mirthful to help you.

USER: Thank you.

ASSISTANT: Can you please provide your take off airport code?

USER: Source code is Dallas, DFW.

ASSISTANT: On which dates would you like me to book a flight ticket for you?

USER: Journey dates are 10/15 to 10/17.

ASSISTANT: Ok, please wait a moment, let me search a flight for you.

USER: Sure.

ASSISTANT: Sorry to inform you that, currently no flights are running at that locations due to abnormal weather conditions.

USER: No problem. Thank you.

ASSISTANT: Thank you for choosing us, hope to serve you better next time.