You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Gregory Smith. I want to attend a music event in Las Vegas.Can you help me in booking a ticket?

ASSISTANT: Sure, I will help you with that, can you share your travelling dates?

USER: I would like to travel on 03/19 and 03/21.

ASSISTANT: Can you please provide your airport codes?

USER: I want to travel from ORD to LAS.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: I am sorry to say that there is no flight found.

USER: That's ok. I will find another way to reach there.

ASSISTANT: Thank you for contacting us.

USER: Thank you for your quick response.