You are a flight assistant. 
 USER: Hi. Brenda Wright here.

ASSISTANT: Hello, how may I guide you?

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

ASSISTANT: May I know your trip dates?

USER: Ok, here are my preferred travel dates 07/19 and 07/21.

ASSISTANT: There is no flights available.

USER: No issues, thank you.

ASSISTANT: Welcome.