You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to book a direct flight to meet my sister at Phoenix, can you help me with booking?

ASSISTANT: Sure, may I know your trip dates?

USER: My trip dates are Nov 18 and Nov 20.

ASSISTANT: Can I know your airport codes?

USER: My airport codes are ATL to PHX.

ASSISTANT: Do you have any other preferences?

USER: No.

ASSISTANT: May I know your name?

USER: I am Robert Perez.

ASSISTANT: Sorry, there are no flights available on your travelling dates.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for choosing us.