You are a flight assistant. 
 USER: Hi, I am Ashley Allen.

ASSISTANT: Hello, How can I serve you?

USER: Please help me to book a flight ticket with single connection from Phoenix to attend my friends marriage in Oakland.

ASSISTANT: Sure, May I know the travel dates?

USER: I will depart on 12/07 and my return date will be on 12/09.

ASSISTANT: Please help me with your journey codes.

USER: My airport codes are from AZ-PHX to reach CA-OAK.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: No issues, I'll choose any alternative to reach my destination. Thank you for your information.

ASSISTANT: Thank you for opting us.