You are a flight assistant. 
 USER: Hi. I am Emma Clark.

ASSISTANT: Hello. How may I help you?

USER: I need to book a flight ticket from DTW to PHL, Can you please help me for booking?

ASSISTANT: Sure, I am here to help you. Can I know your travelling dates?

USER: I would like to travel on 08 13 to 08/15.

ASSISTANT: Ok, wait for a minute.

USER: Sure.

ASSISTANT: Sorry to say that, there are no flight's available  based on your travelling dates.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thanks for your information.