You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you today?

USER: I am Mary Nelson. I want to book a ticket to meet my friends at Las Vegas, can you please help me that?

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: May I know your airport codes?

USER: My airport codes are from LGA to LAS.

ASSISTANT: Kindly mention your trip dates?

USER: My travel dates are from 07/20 to 07/22.

ASSISTANT: Do you have any price limit?

USER: I can afford up to 5000.

ASSISTANT: Thanks for your details, there is no flight found on your desired routes.

USER: Ok, no problem. Thank you so much.

ASSISTANT: Thank you for approaching us.