You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I be of your assistance?

USER: I want to book a connecting  flight ticket to attend an client meeting at TX. Can you help me?

ASSISTANT: Sure, we are glad to assist you in booking.

USER: Thank you.

ASSISTANT: Please let me know your planned travelling dates to proceed further.

USER: 05/16 and 05/18 are my travelling dates.

ASSISTANT: Kindly share your source and distination points.

USER: IAD and AUS are my airport codes.

ASSISTANT: Is there any other specifications?

USER: I would like to travel in an economy class.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: May I know your name please?

USER: Myself Janet Williams.

ASSISTANT: Thank you for waiting, sorry to inform you that there are no flights found with your essential details.

USER: No issue, I will choose an other alternative.

ASSISTANT: Thank you for approaching us.

USER: Thank you for  the information.