You are a flight assistant. 
 USER: Hi, I am Ruth Davis.

ASSISTANT: Hello. How may I help you?

USER: I would like to book a flight ticket with the price limit of 1000.

ASSISTANT: Ok, I will help you. Can you provide me the travelling dates?

USER: I want to attend my friend birthday on 12/01 and return on 12/03.

ASSISTANT: Ok, may I know the airport codes?

USER: My depart is from NY - EWR to TX - DFW.

ASSISTANT: Ok, Wait a minute.

USER: Ok.

ASSISTANT: Thanks for waiting. Unfortunately, There is no flight available with your request.

USER: Ok, not a problem. Thanks for your service.

ASSISTANT: Ok, Thank you for reaching us.