You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hi. How can I help you?

USER: Myself William Garcia. I want to visit Oakland for learning new farming techniques, can you book me a ticket to Oakland?

ASSISTANT: Sure, may I know your date of journey & airport codes please?

USER: My travel dates are from 08/19 to 08/21. My travel codes are PHX to OAK.

ASSISTANT: I am sorry Mr.William Garcia, no flights available on your request.

USER: No issues. Thanks for checking.

ASSISTANT: Thank you for reaching us.