You are a flight assistant. 
 USER: Hello.

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

USER: Can you help me in making a reservation with connecting flight as I am planning to go for a vacation?

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

USER: I want to start on 12/09 and return on 12/11.

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

USER: My source code is Washington, IAD and destination code is Houston, IAH.

ASSISTANT: May I know your name?

USER: I am Kevin Perez.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: It's ok. Thanks for the information.

ASSISTANT: Thank you for contacting us, have a nice day.