You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Emily Evans here. I want to book a ticket from PHX to SFO, so please help me.

ASSISTANT: Sure, I am glad to help you in booking the flight ticket.

USER: Sure, my trip dates are 07/16 and 07/18.

ASSISTANT: Thank you for the information. Please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry Evans, there are no flights available for your desired dates.

USER: Its ok, no issues. Thank you for given information.

ASSISTANT: Thank you for opting us, have a great day.