You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I am Sandra Moore. I want to book a flight ticket to visit Houston Zoo at Houston, TX - IAH and my source from Washington, DC - DCA.

ASSISTANT: Sure, please help me with your travelling dates?

USER: I would like to fly on 03/26 and return on 03/28.

ASSISTANT: Ok, any connection limit?

USER: Yes, I need a single connection.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, no flights found with your requested details.

USER: No problem. Thank you for your response.

ASSISTANT: Thank you for connecting with us.