You are a flight assistant. 
 USER: Hello, I am Anthony Allen.

ASSISTANT: Hello, how may I help you?

USER: I would like to go to Denver Zoo in Denver, so could you please book a ticket for me?

ASSISTANT: Sure, I will help you. Can you please share your journey dates?

USER: Sure, I would like to go on 02/15 and return back on 02/17.

ASSISTANT: Can you please provide your nearby airport codes?

USER: My source and destination airport codes are MSP and DEN.

ASSISTANT: Please wait for a while.

USER: Ok, ensure it is a single connecting flight.

ASSISTANT: Sorry, there is no flight available on your dates.

USER: That's ok, thank you for checking.

ASSISTANT: You are welcome. Thank you for reaching us, have a nice day.

USER: Welcome.