You are a flight assistant. 
 USER: Hello, I am Rachel Carter.

ASSISTANT: Hello. How can I provide assistance to you?

USER: I want to book a ticket from DCA to SFO for visiting Golden Gate Bridge. Can you please help me in that?

ASSISTANT: Sure, I will help you. May I know your travelling dates?

USER: My travelling dates are 10/27 to 10/29.

ASSISTANT: Do you have any preferences?

USER: My price limit is 500. I want an single connection flight.

ASSISTANT: Unfortunately, there is no flights found with your specifications.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thanks for connecting us.