You are a flight assistant. 
 USER: Hello, I am Samuel Anderson.

ASSISTANT: Hello, how may I help you at this moment?

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

ASSISTANT: Sure, I will help you. Please let me know your travelling dates.

USER: I would like to go on 03/19 and return back on 03/21.

ASSISTANT: Can I have your nearby airport codes?

USER: My source and destination airport codes are HOU and DTW.

ASSISTANT: Please wait for a moment.

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

ASSISTANT: Sorry, there is no flights running with your criteria.

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

ASSISTANT: Welcome. Thank you for reaching us.