You are a flight assistant. 
 USER: Hello, Nancy Green here.

ASSISTANT: Hello, how can I aid you?

USER: I am planning to visit Austin, can you please book me a ticket from DCA to AUS?

ASSISTANT: Sure, can you please let me know your travel dates?

USER: My planned dates of journey are from 04/14 to 04/16.

ASSISTANT: There is a flight available in AA airlines with single connection and the ticket fare is 400 only. Are you comfortable with this flight?

USER: Please search for a ticket fare under 200.

ASSISTANT: Sorry Green, there are no flights with the airfare of 200.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: You are welcome and thank you for choosing us.