You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I suggest you?

USER: I want to travel from  Boston to Houston.

ASSISTANT:  Please, could you make sure your airport codes and travelling dates?

USER: My journey dates are from dec/28 to dec/30. My airport codes are MA-BOS to TX-IAH. I require single connection within the price limit of 200.

ASSISTANT: Thank you for your detailed information, May I know your name please for further booking?

USER: I am Garry Allen.

ASSISTANT: OK, please wait for a moment, I let you know about availability of flight.

USER: OK>.

ASSISTANT: I apologize to inform you that, there is no flight available according to your request.

USER:  OK, thank you for your service.

ASSISTANT: Thank you, have a good day.