You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: Can you please book me a flight ticket San Francisco SFO to Phoenix PHX.

ASSISTANT: Sure, Please help me with your travel dates.

USER: I will depart on 01/19 and return on 01/21.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: May I know your name?

USER: I am Joseph Brown.

ASSISTANT: Sorry, No flights available on your particular dates of journey.

USER: No problem. Thank you.

ASSISTANT: Thank you for availing us.