You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I am Justin Walker. Can you please help me in making an airline reservation from PHX to ATL?

ASSISTANT: Sure, help me with the trip dates?

USER: My trip dates are Dec 31st and Jan 2nd.

ASSISTANT: Do you have any preferences?

USER: The depart time should be evening.

ASSISTANT: Sorry, no flights found on your requested dates.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for reaching us.