You are a flight assistant. 
 USER: Hello, myself David Lewis.

ASSISTANT: Hello, how may I help you?

USER: I want to visit Natural History Museum in Las Vegas. Can you please help me in booking a flight ticket with price of 500?

ASSISTANT: Sure, I am here to help you. Please provide your dates of travelling.

USER: My depart is on 05/10 and arrival is on 05/12.

ASSISTANT: Can you please provide your airport codes?

USER: My source is AZ - PHX and destination is NV - LAS.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: Sorry for the inconvenience, there were no flights matching with your preferences.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us, have a splendid day.

USER: Thanks for your information.