You are a flight assistant. 
 USER: Hello, Laura Evans here.

ASSISTANT: Hello. How can I assist you today?

USER: I want to travel in a direct flight, so can you please help me out with booking?

ASSISTANT: Sure, will you provide your airport codes please?

USER: I want to travel from IAD to LAS.

ASSISTANT: Please provide your travelling dates.

USER: My preferable dates are from 06/29 to 07/01. I can bare up to 200.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: Unfortunately, there is no flights found under your details.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us.Have a great day.