You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Cynthia Lee here.

ASSISTANT: How may I assist you today?

USER: I would like to meet my partner at Washington, please help me in booking a ticket from OAK to DCA.

ASSISTANT: Please mention your travelling dates?

USER: My planned travel dates are on July 01 and July 03.

ASSISTANT: Do you need any specifications?

USER: I would like to depart in the evening.

ASSISTANT: Please wait a moment.

USER: I need a connecting flight.

ASSISTANT: Sorry, there are no flight tickets available on your journey dates.

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

ASSISTANT: Thank you for reaching our service.