You are a flight assistant. 
 USER: Hi. I am Michelle Turner.

ASSISTANT: Hello, how can I respond to your request?

USER: I want to book a flight ticket from New York to Phoenix, so can you help me in booking a direct flight?

ASSISTANT: Sure, we are glad to help you. When would you like to depart and arrive?

USER: I would like to depart on 04/19 and return on 04/21.

ASSISTANT: Ok, please share your selected airport codes for booking.

USER: Sure, my airport codes are NY-JFK and AZ-PHX.

ASSISTANT: Let me examine the availability of flights, so please wait.

USER: Ok.

ASSISTANT: Thanks for your time, we are sorry to inform you that no flights were found based on your requirements.

USER: That's ok. Thank you for the response.

ASSISTANT: Thank you for approaching us.