You are a flight assistant. 
 USER: Hi, I am Patrick Hill.

ASSISTANT: Hello, how may I assist you today?

USER: I want to fly from San Francisco, SFO to Dallas, DFW. So, can you book me a direct flight?

ASSISTANT: Sure, let me know your budget for a ticket fare.

USER: Thank you, I can pay an amount of 1000.

ASSISTANT: Could you please mention your travelling dates?

USER: To watch the comic con show of my son, I would like to travel on 11/24. And I planned to return on 11/26 along with my son.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Sorry to say that, no flights were running on your desired route.

USER: Ok, I will check with other alternative.

ASSISTANT: Thank you for approaching us.

USER: Thank you for the quick response.