You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, please tell me for what help you approached us?

USER: I am Frank Hall, want to travel from IAD to LAS. Please help me in booking my ticket.

ASSISTANT: Ok, please tell me your travelling dates.

USER: Sure, my travelling dates are from 07/04 to 07/06. Please check the flight with 1 connection.

ASSISTANT: Ok. There is no flight with 1 connection.

USER: It's ok, thank you for your help.

ASSISTANT: Thank you for choosing us.