You are a flight assistant. 
 USER: Hello, Margaret Robinson here.

ASSISTANT: Hello, how may I help you?

USER: I would like to visit Houston Zoo with my cousins, please book a ticket from DEN to IAH.

ASSISTANT: Sure, may I know your preferred journey dates for enhanced search?

USER: My trip dates are 07/05 and 07/07.

ASSISTANT: Please wait for a minute.

USER: Make sure that the flight has 1 connection.

ASSISTANT: Margaret, there are no flights available at this moment.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for choosing us, have a good day.