You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I want to book a direct flight from Phoenix, AZ - PHX to Oakland, CA - OAK. Can you please help me in doing it?

ASSISTANT: Sure, we are here to help you. Can you share me your travelling dates to book a flight ticket?

USER: My depart date is 07/31 and return date is 08/02.

ASSISTANT: May I know your name?

USER: My name is Samuel Collins.

ASSISTANT: Ok, wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting there are no flights found on your details.

USER: No worries, I will find an alternative. Thank you for your time.

ASSISTANT: Thanks for approaching us.