You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I lend a hand to?

USER: I am Sandra Phillips. I would like to meet my sister on her birthday, please book my flight ticket from HOU to DTW.

ASSISTANT: Sure, I am here to help you for this. Could you please share me your travel dates?

USER: I will depart on Oct 14th and I have to return back in the evening on Oct 16th.

ASSISTANT: Do you prefer any airline preference?

USER: I prefer for a normal-cost airlines.

ASSISTANT: Is there any other requirements regarding your journey?

USER: I need single connection flight.

ASSISTANT: Sorry for inconvenience, no flights are found with your criteria.

USER: No problem. Anyway, thank you.

ASSISTANT: Thank you very much for contacting our agency.