You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am planning to attend a Sports Live Event in ORD, can you please help me in booking a flight ticket from LAS?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: I want to fly on Dec 21 and return on Dec 23.

ASSISTANT: Do you have any specifications?

USER: I would like to prefer normal cost airline.

ASSISTANT: Please provide your name.

USER: Myself Virginia Roberts.

ASSISTANT: Do you have any other preferences?

USER: I would like to prefer economy class.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no flights found under your preferable details.

USER: Not an issue. Thank you.

ASSISTANT: Welcome, have a great day.