You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How may I assist you?

USER: Raymond Allen here, I would like to travel from PHX to visit Columbia center with my friends at SEA. Can you please book a ticket on 11/25?

ASSISTANT: Sure, Please let me know the return date.

USER: 11/27 is my return journey date.

ASSISTANT: Very sorry, No flights found with your chosen dates.

USER: Not a problem, thank you.

ASSISTANT: Thank you for opting us.