You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am William Green here.

ASSISTANT: How can I help you?

USER: I want to reserve my ticket from ATL to PHL to visit Philadelphia, can you please help me in booking?

ASSISTANT: Let me know your travelling dates.

USER: Sure, my dates of journey are from Nov, 21 to Nov, 23.

ASSISTANT: Do you have any preference?

USER: Yes, I need a return time at evening.

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: Ok, no problem. I will try with the another booking agency. Anyways, thank you for your appreciable service.

ASSISTANT: Thank you.