You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Margaret Roberts, want to travel from PHX to LGA. Please help me in booking my ticket.

ASSISTANT: Sure, please provide your trip dates.

USER: Sure, my trip dates are from 02/14 to 02/16. Please check for the direct flight.

ASSISTANT: Sure, please wait a minute.

USER: Ok.

ASSISTANT: Sorry Roberts, there is no flights available.

USER: It's ok, thank you for your help.

ASSISTANT: Most welcome.