You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Can you please help me to find a flight from New York in a normal-cost airlines?

ASSISTANT: Sure, may I know your airport codes?

USER: Thank you. The preferred airport codes are JFK and LAS.

ASSISTANT: please mention your preferred travelling dates.

USER: I am willing to travel on the dates are Jan 29 and Jan 31.

ASSISTANT: Any specifications needed?

USER: Yes, I am comfortable to catch the return flight which is in the evening time.

ASSISTANT: Sorry, no flights are running in the evening.

USER: It's ok, I will choose some other source to travel. Anyhow thank you for checking the flight availability.

ASSISTANT: Can I know your name for our documentation purpose.

USER: My name is Amy Nelson.

ASSISTANT: Thank you for reaching our service.

USER: You are welcome.