You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Angela Walker.

ASSISTANT: How can I assist you?

USER: Can you help me to book a flight ticket to PHL from DTW in the month of April to meet my friend over there?

ASSISTANT: Sure, can I know the travel dates please?

USER: Sure, my travel dates are 04/14 and 04/16.

ASSISTANT: Ok, wait a moment please.

USER: Sure.

ASSISTANT: Sorry Walker, there are no flights available on your dates.

USER: Not an issue, anyways thank you for the information.

ASSISTANT: Thank you for approaching us.