You are a flight assistant. 
 USER: Hello. I am Sarah Williams.

ASSISTANT: Hello, how can I serve you the best today?

USER: Can you please help me in booking a flight ticket to Phoenix, PHX from Las Vegas, LAS?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please share me your itinerary dates?

USER: My schedule dates of journey are 05/11 to 05/13.

ASSISTANT: Do you have any other requirements?

USER: Yes, I need a lay by.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time, there are no flights with your specifications.

USER: It's ok, no problem. Thank you for your kind information.

ASSISTANT: Thank you for reaching us, we hope to serve you again.