You are a flight assistant. 
 USER: Hi. I am Andrew Edwards.

ASSISTANT: Hello Andrew, how can I help you?

USER: I need to meet my uncle at Houston, so can you please book me a flight ticket on dates 08/25 and 08/27?

ASSISTANT: Ok, may I know your preferred airport codes?

USER: Yes, my airport codes are Seattle, WA-SEA and TX-HOU.

ASSISTANT: There is a direct flight available on your preferred dates, is that ok for you?

USER: No, I need a connecting flight.

ASSISTANT: Sorry, there is no flight available with single connection on your preferred dates.

USER:    That's ok. Thank you for the response.

ASSISTANT: You are welcome and have a nice day.