You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I would like to book a flight ticket from SFO, will you please aid me in booking a flight ticket to PHX?

ASSISTANT: Sure. May I know your name please?

USER: Stephen Robinson is here.

ASSISTANT: Tell me your travel dates and connection limit please?

USER: My travel dates are Dec 29th and Dec 31st.

ASSISTANT: Ok.

USER: I prefer to travel in a single connection.

ASSISTANT: Any other preferences?

USER: No.

ASSISTANT: Wait for a moment please.

USER: Sure.

ASSISTANT: Thanks for your time. Sorry to say that there are no flights available.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you.