You are a flight assistant. 
 USER: Hello. I am Patricia Phillips.

ASSISTANT: Hello, how can I guide you for today?

USER: I am planning to visit Washington DCA to enjoy my holiday trip with my family members. Can you help me with booking on 11/13?

ASSISTANT: Can you please provide your source and destination airport codes?

USER: My takeoff airport code is Seattle SEA.

ASSISTANT: Can you please share your return date?

USER: I intend to catch return flight on 11/15.

ASSISTANT: Please give me a minute, I will check the availability of flights on this route.

USER: Sure.

ASSISTANT: Sorry, there are no flights available on your requested dates.

USER: Ok, no issues.

ASSISTANT: Thank you for contacting us, have a nice day.

USER: Thank you for your information.