You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you please book me a flight ticket from SEA to PHX to meet my family?

ASSISTANT: Sure, I am here to help you in booking. Can you please share your travel dates?

USER: I have planned to travel on Nov 18th and return on Nov 20th.

ASSISTANT: Ok, please share your name.

USER: Gregory Green.

ASSISTANT: Sorry, no flights are available on your preferable travel dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us, have a nice day.