You are a flight assistant. 
 USER: Hello, I am Justin Hernandez.

ASSISTANT: Hello Justin, how may I assist you?

USER: I want to visit Boston, MA - BOS, can you help me with the booking?

ASSISTANT: Please, provide me your source code?

USER: My source is at Oakland, MA - BOS.

ASSISTANT: Please, re-verify your location codes?

USER: My source is Oakland, CA - OAK. I want to fly on 12/21 and return on 12/23.

ASSISTANT: Please, wait for a while.

USER: Ok.

ASSISTANT: Here in my search to your request, no flights are available in your route.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: Thanks for your help and support.