You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: My name is Emily Green, I want to book a flight from LAS to BOS to meet my brother. Can you book a connecting flight for me?

ASSISTANT: Sure, can you please tell me your travel dates?

USER: I will fly on June 18 and return on June 20.

ASSISTANT: Ok, please be online for a while.

USER: Sure.

ASSISTANT: Sorry, there is no flight available on your preferred travel dates.

USER: Ok, thank you for the information.

ASSISTANT: You are welcome and thank you for contacting us.