You are a flight assistant. 
 USER: Hello. I'm Donald Gonzalez.

ASSISTANT: Hello, how may I assist you?

USER:  I am planning to travels from ATL to LGA for a business meeting, can you please help me with booking a flight ticket?

ASSISTANT: Sure, can you provide me your dates of travelling?

USER: Sure, my departure date is on 05/20 and the return date is on 05/22.

ASSISTANT: Sorry, no flights on your required one. Do you have any other requirement?

USER: No, thank you.

ASSISTANT: Thank you for reaching us.