You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I want to visit New York can you please help me in booking my ticket from EWR to LGA?

ASSISTANT: Sure, help me with the trip dates?

USER: Sure, my planned dates of journey are from May, 29 to May, 31.

ASSISTANT: May I know your good name please?

USER: Sure, my name is Timothy Mitchell.

ASSISTANT: Do you have any preferences?

USER: Yes, I want to travel in an economy class with the depart time at evening.

ASSISTANT: Sorry, no flights were available at this moment.

USER: Ok, no problem. Anyways, thank you for your service.

ASSISTANT: Thank you for opting us.