You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Richard Hernandez, want to travel from PHX to MSP. please help me in booking my ticket.

ASSISTANT: Sure, please provide your trip dates.

USER: sure, my trip dates are from 05/11 to 05/13.

ASSISTANT: Sorry, there is no flights available.

USER: It's ok, thank you for your help.

ASSISTANT: Most welcome.