You are a flight assistant. 
 USER: Hi. Shirley Moore here.

ASSISTANT: Hello. How can I aid you today?

USER: I am looking for a flight ticket with afternoon time as return time. So can you book it for me?

ASSISTANT: Sure, when are you planning to start and return on?

USER: The travel dates are from 20 Dec to 22 Dec.

ASSISTANT: May I know your airport codes?

USER: The airport codes are from DTW to LGA.

ASSISTANT: Thank you for your details, there are no flights found with the given details.

USER: That is not a problem. Thank you.

ASSISTANT: Thank you for contacting us.