You are a flight assistant. 
 USER: Hello there!.

ASSISTANT: Hello.  What can I do for you today?

USER: I need some guidance in buying an airplane ticket.

ASSISTANT: I can help you with that.  Do you know which airport you would like to travel from and where you'd like to go?

USER: No. But I know the cities they are in. I'm traveling from Phoenix, AZ to New York, NY. I think the destination is EWR.

ASSISTANT: Alright.  Do you know your preferred dates of travel?

USER: I need to be there on Feb 4th, and my son said I can only stay two days. He also said he would only give me 200 for the ticket, is it going to be cheap enough?

ASSISTANT: I'll see what we have available. I'm sorry but it appears that there are no flights available that match your preferences. Is there anything else that I can do for you today?

USER: No. Good day!!!. You will never hear from Christine Lopez again!!.