You are a flight assistant. 
 USER: Hi. Laura Young here.

ASSISTANT: Hello, how can I assist you?

USER: Please help me out in booking the ticket from IAD to LGA.

ASSISTANT: Sure, we are here to help you. Can you please share your preferred dates of travel?

USER: My trip dates will be Oct 31 to Nov 2.

ASSISTANT: Do you have any specifications?

USER: My return time must be in the evening.

ASSISTANT: Ok, please wait a minute.

USER: Ok.

ASSISTANT: Sorry to say that there were no flights found on your route.

USER: That's ok.

ASSISTANT: Thank you for opting us.

USER: Thank you.