You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Daniel Brown.

ASSISTANT: How can I help you today?

USER: I would like to book a flight ticket within the fare limit 5000 from New York, can you help me to book an economy class ticket?

ASSISTANT: Sure, I am here to help you in booking. Can you please share your travel dates?

USER: I need to depart on Apr 19th and my return date will be on Apr 21st.

ASSISTANT: Ok, may I know your travelling airport codes?

USER: My source and destination airport codes are JFK and IAD.

ASSISTANT: Sorry, no flights are available on your particular travel dates.

USER: No issues, I'll choose any alternative to reach my destination. Thank you for your help.

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