You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I am Gregory Miller want to visit Oakland, can you book a ticket within the fare of 1000?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: Sure, my travelling dates will be 04/26 and 04/28.

ASSISTANT: Please provide your airport codes that you want to travel.

USER: Yes, I want to fly from DFW to OAK.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no flights found under your requested details.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Welcome, have a great day.