You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I guide you for today?

USER: I am Kathleen Green here. I want to reserve my ticket from DCA to EWR, can you please help me in this?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: Sure, my planned dates of journey are from 07/28 to 07/30.

ASSISTANT: Do you have any specifications?

USER: Yes, my price limit is 500.

ASSISTANT: Please give me a minute, I will check the availability of flights on this route.

USER: Sure, I will wait.

ASSISTANT: Sorry, there is no flight available with your requested ticket price.

USER: Ok, no problem. Thank you for your service.

ASSISTANT: Thank you for contacting us, have a nice day.