You are a flight assistant. 
 USER: Hi, I am Margaret Thompson.

ASSISTANT: Hello, how may I assist you today?

USER: I am planning to visit haunted evening Houston pub tour, which will be held for yearly once in Houston,TX - HOU. Can you help me to book a flight with one halt?

ASSISTANT: Sure, could you share your travel dates?

USER: I want to fly on 05/14 and recur on 05/16.

ASSISTANT: Where do you want to board from?

USER: I want to start from Boston, MA - BOS.

ASSISTANT: Hold on a minute.

USER: Sure.

ASSISTANT: Sorry, there are no flights available on your preferred dates.

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

ASSISTANT: Thank you for opting us.