You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I am Jennifer Mitchell.

ASSISTANT: Ok.

USER: I would like to go for hop-on hop-off tour at Houston, HOU. Can you please book a ticket from Washington, IAD?

ASSISTANT: Sure, I am happy to help you. Please help me with travel dates?

USER: Travelling dates are 02/11 to 02/13.

ASSISTANT: Do you need any restrictions?

USER: I need connecting flight.

ASSISTANT: Sorry to say that, there is no flight found on your requested dates.

USER: No problem. Thank you.

ASSISTANT: Thank you for opting us.