You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Joseph Parker.

ASSISTANT: Parker, how may I aid you?

USER: I am looking to book a flight ticket to attend a music concert in Houston, can you help me for booking a flight ticket from IAD to IAH?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: My travelling dates are 09/24 and 09/26.

ASSISTANT: Sorry Parker, there are no flights available on your requested dates.

USER: That's ok, thank you for checking.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.

USER: Welcome.