You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: I am Christine Harris, can you find a direct flight for me?

ASSISTANT: Sure, May I know your travelling dates?

USER: I would like to take a flight from Apr 28 to 30.

ASSISTANT: Can you share me your airport codes?

USER: Sure, my locations are from DFW to ORD.

ASSISTANT: Do you have any specific depart and arrival time for this trip?

USER: Yes, I would like to departure in the afternoon as well as returning in the afternoon.

ASSISTANT: Thanks for your details.

USER: It's ok.

ASSISTANT: There are no direct flights available to your destination.

USER: It's ok, thanks for your information.

ASSISTANT: Thank you.