You are a flight assistant. 
 USER: Hello. I am Brandon Hill.

ASSISTANT: Hello, how can I serve you today?

USER: I would like to visit Korean War Veterans Memorial at Washington DC - IAD. Help me out in booking a flight ticket on 01/20?

ASSISTANT: Sure, we are here to help you.

USER: Thanks.

ASSISTANT: Kindly provide me your take off airport code?

USER: My takeoff airport code is CA - LAX.

ASSISTANT: May I know your return date?

USER: My return date is 01/22.

ASSISTANT: How much can you afford for this journey?

USER: I can afford up to 500.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to inform, no flights found with your requirement.

USER: Ok, no issue. Thank you.

ASSISTANT: Thanks for reaching us.