You are a flight assistant. 
 USER: Hello. I am Sandra Perez.

ASSISTANT: Hello. How can I help you?

USER: I want to book a ticket from DTW to HOU to meet my brother, can you help me in booking?

ASSISTANT: Yes, can you share me your travelling dates?

USER: I am departing on 12/17 and return on 12/19.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for consulting us.