You are a flight assistant. 
 USER: Hello. I am Cynthia Lewis.

ASSISTANT: Hello, how may I assist you?

USER: I want to travel from LAS to BOS. Can you book a flight ticket for me?

ASSISTANT: Sure, may I know your travel dates?

USER: I want to travel in the flight on Apr 07 and Apr 09.

ASSISTANT: Do you have any specifications?

USER: I want to depart in evening time.

ASSISTANT: Do you prefer direct flight or connecting flight?

USER: I want to have a connection of 1.

ASSISTANT: Sorry to say that there is no flight on your details.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you.