You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: Christopher Parker here. I want to travel from Houston to Seattle for a business trip. Can you please help me for booking the flight ticket?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: My departure date is 06/14 and return date is 06/16.

ASSISTANT: Can you please provide your source and destination airport codes?

USER: My airport codes are from IAH to SEA. Make sure my connections limit is 0.

ASSISTANT: Sorry, there is no direct flight on your requested route. Thank you for contacting us, have a nice day.

USER: Anyway, thanks for the information.