You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: I am searching for a direct flight for my journey, can you please help me out with that?

ASSISTANT: Sure, can you share your travel dates please?

USER: Ok, my travelling dates are May 23 and May 25.

ASSISTANT: May I know your specific airport codes please?

USER: Sure, I want to travel from LAS to DCA.

ASSISTANT: Please share me your name.

USER: Sure, my name is Ashley Campbell.

ASSISTANT: Is there any other requirements to be met?

USER: I want to go in a economy class flight.

ASSISTANT: Sorry, there is no flight service on your required dates.

USER: Oh! Sad to hear that. Anyway, I will find another alternative. Thank you for checking.

ASSISTANT: Thank you for contacting us.