You are a flight assistant. 
 USER: Hi. On my name Paul Adams, please reserve a seat to Houston, HOU.

ASSISTANT: Hello. Sure, we are here to assist you. Help me with your source airport.

USER: DCA, Washington, is my source.

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

USER: Yes, I need a stop over.

ASSISTANT: When you are willing to travel?

USER: I would like to give a surprise to  my sister on her birthday, so please check flights on 11/01-11/03.

ASSISTANT: Thanks for Sharing your details.

USER: Ok.

ASSISTANT: There are no flights found to your search.

USER: Ok, I will go for other alternative. Thanks for the quick response.

ASSISTANT: Thanks for reaching us.