You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Sandra Lewis here. I am looking for a flight ticket with evening as the return time. So can you book it for me?

ASSISTANT: Sure, may I know your airport codes?

USER: The airport codes are from ORD to DTW.

ASSISTANT: On which dates you are planning to travel?

USER: Yes, the travel dates are from Dec 18 to Dec 20.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Thank you for waiting and we have found a flight in economy class with 1 connection in UA airlines and the fare of your flight will be 100. Do you like me to proceed your booking with this flight?

USER: I am happy with the airlines and fare. You can book it.

ASSISTANT: Thank you so much.

USER: Thank you.