You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you today?

USER: I am Elizabeth Clark.

ASSISTANT: Ok.

USER: I am planning to take my kids to funfair exhibition on their vacation.Can you please book a flight ticket to Washington, DCA?

ASSISTANT:  Sure, I would be happy to help you.

USER: Thank you.

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

USER: I would like to board from Houston, HOU.

ASSISTANT: Do you prefer any halt in between your journey?

USER: Yes, there should be a lay by.

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

USER: My preferable dates of journey are 03/16 to 03/18.

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

USER: Sure.

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

USER: It's ok, no problem. Thank you for your response.

ASSISTANT: Thank you for choosing us.