You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Can you help me in booking a flight ticket from BOS to DFW?

ASSISTANT: Yes, can you share me your travelling dates?

USER: I will start on Dec, 13 and return on Dec, 15.

ASSISTANT: Do you have any other specifications?

USER: I need a direct flight and travel in normal cost airlines only.

ASSISTANT: Give me a moment.

USER: Please make sure that my depart time should be at afternoon and return time should be at morning.

ASSISTANT: Sorry to inform you that there are no flights found on your requested criteria.

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

ASSISTANT: Can you tell me your name for documentation?

USER: Jennifer Phillips here.

ASSISTANT: Thank you for consulting us.