You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I'm Debra Lewis.

ASSISTANT: Nice to meet you Lewis, how can I assist you today?

USER: I am planning to travel from HOU to DTW to attend my sister's wedding anniversary, can you please help me with booking a flight ticket?

ASSISTANT: That's nice, I will help you with that. On which dates do you like to travel?

USER: Sure, my departure date is on 09/21 and the return date is on 09/23. Please make sure that the connection limit should be 1.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for your patience. Sorry Lewis, there is no flight for your dates. Thank you for reaching us.

USER: Ok, no problem. Thank you for your help.