You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Emily Nelson.

ASSISTANT: How can I assist you?

USER: Can you help me in booking a flight ticket from DCA to HOU?

ASSISTANT: Sure, can I know the travel dates please?

USER: I want to travel on 12/24, and return on 12/26.

ASSISTANT: Could you please provide the departure and return time?

USER: I want to return in the afternoon time.

ASSISTANT: Do you have any requirements?

USER: I need a single connecting flight.

ASSISTANT: Ok, wait a moment please.

USER: Sure.

ASSISTANT: Sorry, there are no flights available as per your request.

USER: Ok, no issues.

ASSISTANT: Thank you for approaching us.

USER: Thanks for the information.