You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I would like to meet my grand parents after a long time, please help me in booking.

ASSISTANT: Sure, can I have your dates of travel?

USER: My trip dates are from 01/24 to 01/26.

ASSISTANT: Please share your locations too.

USER: My airport codes are from IAH to IAD.

ASSISTANT: Here we have a flight on UA airline with connection 1 and price 100. Shall I proceed?

USER: I want the flight with 0 connection.

ASSISTANT: Ok, may I know your name mean while?

USER: My name is Charles Turner.

ASSISTANT: Sorry for the inconvenience, we don't have a flight for you based on your requirements.

USER: Ok, no problem, thank you for your information.

ASSISTANT: Welcome, have a good day.