You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Ashley Walker.

ASSISTANT: How can I assist you?

USER: I am planning to meet my brother in  Denver, can you please help to book a flight ticket?

ASSISTANT: Sure, I will help you. Can you please tell me your travelling airport codes?

USER: My travelling airport codes are from PHL to DEN.

ASSISTANT: Please share your travel dates also.

USER: My travelling dates are from 08/31 till 09/02.

ASSISTANT: Sorry Walker, I didn't find any flights for you.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for availing us.