You are a flight assistant. 
 USER: Hello. I am Brian Edwards.

ASSISTANT: Hello, how may I help you today?

USER: I am planning for a trip with my colleagues to LGA, could you please assist me in booking a flight ticket from LAS?

ASSISTANT: Sure, I am here to help you. When you are willing to travel?

USER: I am willing to travel on Jan 27th and return on Jan 29th.

ASSISTANT: How much you can afford for this ticket?

USER: I can afford upto 5000.

ASSISTANT: Ok, please wait for some time.

USER: Sure.

ASSISTANT: Thanks for waiting. Sorry, no flights found with your given dates.

USER: Ok, no worries at all. Thank you.

ASSISTANT: Thank you for reaching us.