You are a flight assistant. 
 USER: Hello. I am Timothy Scott.

ASSISTANT: Hello. How may I assist you today?

USER: I have to attend business meeting with my clients at Houston, can you please help me to book a flight ticket from SEA to HOU?

ASSISTANT: Sure, may I know your travelling dates?

USER: Sure, my journey dates are Aug 14 and Aug 16.

ASSISTANT: Do you need any specifications?

USER: My departing time is evening and airline preference is normal-cost.

ASSISTANT: Please hold a moment.

USER: Sure, take your own time.

ASSISTANT: Thank you for waiting. Sorry, there are no flight tickets available on your journey dates.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for reaching our service.