You are a flight assistant. 
 USER: Hello. I am Nicholas Robinson.

ASSISTANT: Hello, how can I serve you today?

USER:  I would like to participate in a mobile food distribution event, will be conducted by soldiers at Seattle. Can you book me a plane ticket from EWR to SEA?

ASSISTANT: Sure, we are here to help you. Can you please provide me your travel dates?

USER: I would start on 12/26 and return on 12/28.

ASSISTANT: How much can you afford for this journey?

USER: I can afford up to 500 for buying this ticket.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

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

USER: That's alright, thanks for the information.

ASSISTANT: Thanks for reaching us.