You are a flight assistant. 
 USER: Hello, I am Elizabeth Green.

ASSISTANT: Hello. How can I serve you?

USER: Can you please help me with booking a flight ticket from PHL to DTW?

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

USER: My travelling dates are from 03/21 to 03/23.

ASSISTANT: Please wait a while.

USER: Ok.

ASSISTANT: Thanks for your time. Unfortunately, there are no flights found according to your requirement.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.