You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Please reserve me a flight ticket from PHX to BOS.

ASSISTANT: Sure, may I know your travel dates?

USER: My travel dates are from June 3rd to June 5th.

ASSISTANT: Do you have any specifications?

USER: Yes, I want a single stopover in between my journey.

ASSISTANT: May I know your name?

USER: I am Betty Smith.

ASSISTANT: Ok, please wait a minute.

USER: Ok.

ASSISTANT: Sorry, there were no flights found on your route.

USER: No problem, thank you.

ASSISTANT: Thank you.