You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Ronald Baker.

ASSISTANT: How can I assist you today?

USER: Can you please book me a ticket with the fare of 500?

ASSISTANT: Sure, please mention your airport codes.

USER: I would like to fly from MSP to DCA.

ASSISTANT: May I know your dates of journey?

USER: My travel dates are from 10/29 to 10/31.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: Unfortunately, no flights were found on your desired route.

USER: No problem.

ASSISTANT: Thank you for opting us.

USER: Thank you.