You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you out?

USER: I am Lisa Thompson. I am looking for a flight from PHL to DFW, can you help me out?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: My trip dates are from Nov 21st till Nov 23rd.

ASSISTANT: Do you need any specifications?

USER: I need to take off my flight in evening.

ASSISTANT: Can I know your preferences?

USER: I need a connecting flight that's it.

ASSISTANT: Sorry, there are no flights found.

USER: That's ok, not an issue. Thank you for your help.

ASSISTANT: Thank you for reaching us.