You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I want to book a flight tikcet from SFO to PHX. Could you help me in booking?

ASSISTANT: Can I know your travelling dates?

USER: My travelling dates are from Jan 11 - 13.

ASSISTANT: Do you have any specifications?

USER: I prefer for business class with single connection.

ASSISTANT: May I know your name.

USER: Emma Baker here.

ASSISTANT: Sorry, there are no flight tickets available on your journey dates.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for reaching our service.