You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am Eric Martin. Please book a flight on 04/17.

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Can you provide me your journey locations?

USER: Sure. I am collecting funds to an orphanage located in Phoenix, PHX. So, I will start from Oakland, OAK.

ASSISTANT: May I know your return date?

USER: Return date is 04/19.

ASSISTANT: Ok, wait for some time.

USER: Sure.

ASSISTANT: Thanks for waiting there is no flights found on your details. Thanks for choosing us.

USER: Thank you.