You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Carol Thomas.

ASSISTANT: What kind of help you are looking for?

USER: I would like to visit Korean war veterans memorial at Washington DC - DCA, will you help me to book a flight ticket on 10/16?

ASSISTANT: Sure, I can help you.

USER: Thanks.

ASSISTANT: Can I know your boarding point?

USER: Sure, my boarding point is Los Angeles, LAX.

ASSISTANT: When will be your return date?

USER: 10/18 is my return date from Washington.

ASSISTANT: Sorry Carol Thomas, there are no flights found for your journey, on your travel dates.

USER: No issues, thank you.

ASSISTANT: Thanks for approaching us.