You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Carolyn Thomas.

ASSISTANT: Ok.

USER: I am planning to go for science exhibition at Phoenix, PHX. Can you please book a ticket for me?

ASSISTANT: Sure, may I know your planned journey dates?

USER: My depart is on 09/15 and return is on 09/17.

ASSISTANT: Please share your source airport.

USER: Origin code is Oakland, OAK.

ASSISTANT: Do you want connecting flight?

USER: Yes, I need connecting flight.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, no flights found with your given details.

USER: Ok, No problem. Thank you.

ASSISTANT: Thank you for choosing us.