You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am Nancy Jones. Can you help me to search a flight from OAK to DCA?

ASSISTANT: Sure, may I know on what dates you like to travel?

USER: My travelling dates are 09/17 and 09/19.

ASSISTANT: There is a flight from Frontier airlines available on your requested dates with a fare of 300. Shall I proceed to book the ticket?

USER: My price limit is only 200. Do not proceed. Thank you for your help.

ASSISTANT: Ok, have a great day. Most welcome.