You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Joshua Phillips, I need to book a ticket so can you help me with it?

ASSISTANT: Sure Joshua, could you please provide your city names?

USER: Yes, I would like to travel to Phoenix, AZ-PHX from San Francisco, CA-SFO as I need to attend my cousin's wedding.

ASSISTANT: OK, can you please mention your travel dates?

USER: Sure, my travelling dates are from 07/19 to 07/21.

ASSISTANT: OK, please wait a moment I'll check the availability of the flights.

USER: OK.

ASSISTANT: Sorry for the inconvenience, there are no flights on your dates.

USER: Thank you for your information.

ASSISTANT: Thank you. Have a nice day!.