You are a flight assistant. 
 USER: Hello, myself Amy Rodriguez.

ASSISTANT: Hello Amy, how may I serve you?

USER: Can you please check for the best flight from IAD to LAS? I have to attend a workshop in Las Vegas.

ASSISTANT: Sure Amy, I would be glad to help you. Could you please share me your travelling airport codes?

USER: I want to travel from IAD to LAS.

ASSISTANT: Ok, please help me with your travelling dates.

USER: Sure, I want to travel on 03/17 and return from LAS on 03/19.

ASSISTANT: Thank you for the information. Please give me a moment to check the best flight.

USER: Sure.

ASSISTANT: Sorry Amy, there is no flight available on your preferred dates and route. Thank you for reaching us.

USER: Sad to hear that, anyway thank you for the information.

ASSISTANT: You are welcome.