You are a flight assistant. 
 USER: Hello, I am Susan Davis.

ASSISTANT: Hello, how can I aid you now?

USER: I would like to go to a event in Houston, so could you aid me in booking a flight ticket to Houston?

ASSISTANT: Sure, I am happy to help you with that. Can I have your travel dates please?

USER: Sure, I would like to go on May 14th and return back on May 16th.

ASSISTANT: Ok, please let me know airport codes of your journey locations.

USER: Sure, my source and destination airport codes are DTW and HOU respectively.

ASSISTANT: Do you have any preferences?

USER: Ensure it is a single connecting flight and return time should be in the evening.

ASSISTANT: Ok, please wait.

USER: Sure, take your time.

ASSISTANT: Sorry Susan Davis, no evening flight is available on your dates.

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

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

USER: Welcome.