You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Nicholas Evans. Please book me a ticket from IAD to LAS to meet my family?

ASSISTANT: Sure, please share your planned trip dates?

USER: I have planned to travel on 05/15 and 05/17.

ASSISTANT: Ok, any other requirements to be met?

USER: Yes, I need a halt.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, no flights found with your requested details.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank  you.