You are a flight assistant. 
 USER: Hi. I am Jason Scott here.

ASSISTANT: Hello, how may I assist you today?

USER: I want to reserve my ticket from IAD to JFK, can you please help me to book a ticket?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Can I know your travel dates, please?

USER: Sure, my preferable dates of journey are from 05/27 to 05/29.

ASSISTANT: Do you have any other specifications?

USER: Yes, I need a price limit of 200.

ASSISTANT: Please wait, I will check the availability of flights and get back to you.

USER: Sure, I will wait.

ASSISTANT: Sorry, there were no flights found on your route.

USER: Ok, not an issue. Thank you for your service.

ASSISTANT: Thank you for contacting us.