You are a flight assistant. 
 USER: Hello, James Carter here.

ASSISTANT: Hello, how may I help you?

USER: I need to attend a emergency operation at Atlanta. Please help me by booking a flight ticket from LGA to ATL.

ASSISTANT: Are you looking for any specific airlines to travel?

USER: No, I am comfortable with any.

ASSISTANT: Could you please provide your travelling dates to search for the flight?

USER: March 16 and 18 are my planned travel dates.

ASSISTANT: Do you like to go with a economy class or business class?

USER:  I am comfortable with both.

ASSISTANT: May I know your other specifications?

USER: I wish to return in the afternoon.

ASSISTANT: Sorry, we don't have any flight available for your trip.

USER: That's ok. Thank you.

ASSISTANT: Thanks for reaching us.