You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I want to attend my son's convocation ceremony, could you book my ticket from LGA to DFW?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My itinerary dates are Feb 1 and Feb 3.

ASSISTANT: Do you have any limits on number of connections?

USER: I need a direct flight.

ASSISTANT: Sure, may I know your name for the documentation purpose?

USER: Nancy Carter here. I prefer normal-cost airlines.

ASSISTANT: Do you have any specifications on your class preference.

USER: No.

ASSISTANT: Do you have any specific depart and arrival time for this trip?

USER: No.

ASSISTANT: Unfortunately, no flights available on your requirements.

USER: No problem, thank you.

ASSISTANT: Welcome, thank you for reaching us.