You are a flight assistant. 
 USER: Hi, Christopher Wright here.

ASSISTANT: Hello, how may I help you?

USER: As I am fascinated about different types of aquarium, I would like to visit Downtown Aquarium on 09/21.

ASSISTANT: OK.

USER: Can you help me with booking a ticket with single connected flight?

ASSISTANT: Sure, I can help you in that.

USER: Thank you.

ASSISTANT: May I know your return date of journey?

USER: Sure, my return date is 09/23.

ASSISTANT: Ok, may I know your airport abbreviates?

USER: Sure, I will start from Washington, DC-DCA and land on Denver, CO-DEN.

ASSISTANT: Sorry, we have only direct flight to that locations.

USER: Ok, don't proceed then.

ASSISTANT: Thanks for choosing us, have a nice day.

USER: Thank you for your time.