You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Edward Lewis. I am planning to attend my childhood friend who is staying at Las Vegas LAS. Can you help me with booking a direct flight?

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

USER: I will fly on 05/15 and return on 05/17.

ASSISTANT: Please share your source point?

USER: My source point is Philadelphia PHL.

ASSISTANT: Do you have any price limit?

USER: My fare limit is 500.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there is no direct flight found on your given dates.

USER: Not an issue. Thank you.

ASSISTANT: Thanks for choosing us.