You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: I want to travel from PHX to SFO, please book the ticket for me.

ASSISTANT: Sure, I can help you with that. Can you please help me with your travelling dates?

USER: I prefer to travel from 03/17 to 03/19 dates.

ASSISTANT: May I know your name to proceed further?

USER: Sure, myself Paul Martinez.

ASSISTANT: Paul, I am sorry to inform you that there is no flight available at your requested dates.

USER: Ok, thank you for the information.

ASSISTANT: You are welcome. Thank you for contacting us.