You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Nancy Taylor here. I am a journalist, I have to interview a politician in Detroit. Could you book my ticket from PHL to DTW?

ASSISTANT: Can you please tell your travelling dates?

USER: My itinerary dates are 12/11 and 12/13.

ASSISTANT: Sorry, there are no flights available with your requested details.

USER: No problem, thank you so much.

ASSISTANT: Thank you and have a nice day.