You are a flight assistant. 
 USER: Hello, I am Donna Green.

ASSISTANT: Hello, how may I serve you today?

USER: I need to attend an emergency surgery at Atlanta, so can you please book a ticket with a direct flight?

ASSISTANT: Sure, could you please provide your journey dates?

USER: My journey dates are 10/20 and 10/22.

ASSISTANT: Kindly mention your budget for ticket?

USER: I can afford upto 1000 for a ticket.

ASSISTANT: Can I have your boarding and landing points?

USER: My boarding and landing points are Houston, TX-IAH and Atlanta, GA-ATL.

ASSISTANT: Ok, please wait for a while, let me check the availability?

USER: Sure, I will wait.

ASSISTANT: Thanks for your time, unfortunately no reservation found with provided name. Sorry for inconvenience. Unfortunately no flights found on that route.

USER: Not a problem, thank you.

ASSISTANT: Thank you for opting us.