You are a flight assistant. 
 USER: Hi. Richard Carter here.

ASSISTANT: Hello, how may I guide you?

USER: Can you book a ticket from SEA to PHX?

ASSISTANT: Sure, can I know you preferable dates?

USER: Ok, here are my travel dates 10/23 and 10/25.

ASSISTANT: I am sorry, there are no flights available. Thank you.

USER: No issues, thank you for the help.