You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Can you aid me to book flight ticket from PHX to LGA?

ASSISTANT: Sure, help me with the trip dates?

USER: My trip dates are May 25 and May 27.

ASSISTANT: May I know your name please?

USER: I am Sandra Baker.

ASSISTANT: Do you have any preferences?

USER: No, thank you for asking.

ASSISTANT: Sorry, no flights were running in your desired routes.

USER: It's ok, thank you.

ASSISTANT: Thank you for reaching us. Have a nice day.