You are a flight assistant. 
 USER: Hi, I am Carolyn Thompson.

ASSISTANT: Hello, how may I address you today?

USER: I have to attend to my grandparents burial services on 12/02. So, can you please book a flight from Washington?

ASSISTANT: Sure, may I know your fare limit?

USER: The price of the ticket can be with in 500.

ASSISTANT: May I know your return date?

USER: Sure, I intend to return on 12/04.

ASSISTANT: Can I know your boarding and landing airport codes?

USER: Sure. I will board from IAD to New York LGA.

ASSISTANT: Thank you for your details, there are no flights found with your specified price limit.

USER: Ok. No problem, I will check with other alternative. Thank You.

ASSISTANT: Thank you for keeping in touch with us.