You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: John Miller here. I would like to book a ticket from BOS to EWR, can you please help me with that?

ASSISTANT: Sure, may I know your travel dates?

USER: The travel dates are from 05/27 to 05/29.

ASSISTANT: Do you have any specification?

USER: I need a halt.

ASSISTANT: Sorry, there is no flight on your details.

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

ASSISTANT: Thank you.