You are a flight assistant. 
 USER: Hi. Timothy Wilson here.

ASSISTANT: Hello. How may I render you at this moment?

USER: Can you book a flight ticket for my airport codes that is from SEA to LAS?

ASSISTANT: Sure, may I know your class preference?

USER: No class preference.

ASSISTANT: Ok, on which dates would you like to travel?

USER: The travel dates are from 25 Aug to 27 Aug.

ASSISTANT: Ok, do you prefer a stop over in between the journey?

USER: I am looking for a direct flight.

ASSISTANT: Can I know your good name please?

USER: I am Timothy Wilson.

ASSISTANT: Do you have any other preferences?

USER: No.

ASSISTANT: There are no flights found on your requested dates.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for reaching us.