You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you today?

USER: Can you help me in booking a flight ticket from DCA to SFO?

ASSISTANT: Sure, please share me your trip dates.

USER: I want to travel on 10/06, and return on 10/08.

ASSISTANT: If you can help me with your name, I can check with the availability of flights.

USER: I am Nicole Lewis.

ASSISTANT:  Would you let us know if you have any other preferences?

USER: I prefer for normal cost airline.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for choosing us.