You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I would like to book a flight ticket from SEA to IAH.

ASSISTANT: Sure, could you please provide me your trip dates?

USER: I will be travelling from 11/15 to 11/17.

ASSISTANT: May I know your name please?

USER: My name is James Clark.

ASSISTANT: Clark, please wait for a while.

USER: Ok.

ASSISTANT: Sorry Clark, there are no flights available on your preferred dates.

USER: That's fine. Thank you for checking.

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