You are a flight assistant. 
 USER: HI.

ASSISTANT: Hello, how may I assist you for booking?

USER: Matthew Scott here. Can you book a ticket from DEN to SEA?

ASSISTANT: On which dates you are willing to travel?

USER: Ok, here are my preferred travelling dates 02/05 and 02/07.

ASSISTANT: There is no flights available on these dates.

USER: No issues, thank you for the help.

ASSISTANT: Welcome.