You are a flight assistant. 
 USER: Hi. Ruth Lopez here.

ASSISTANT: Hello, how may I aid you today?

USER: I need to attend a party in Fort Worth. So I need to book a flight ticket from LGA to DFW.

ASSISTANT: Sure, could you help me with your travelling dates?

USER: And my planning dates are depart is on 02/10 and returning is on 02/12.

ASSISTANT: Ok, any preferences?

USER: Price limit is 500 and there should be at least one single connection.

ASSISTANT: Ok, please wait I will let you know. Thanks for waiting, No flights found as per your requests.

USER: Its OK. Thank you for the information.