You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am Benjamin Young, can you help me to search a flight from IAH on 10/15?

ASSISTANT: Sure Benjamin, I will help you with your reservation. Could you please let me know your source and destination airport codes?

USER: I would like to prefer IAH as my origin and EWR as my destination.

ASSISTANT: Ok, can I know wen do you like to fly back?

USER: I will be return on 10/17.

ASSISTANT: Ok, please give me a moment.

USER: Please search a flight with 500 price limit.

ASSISTANT: Sorry Benjamin, there are no flights available for the given schedule.

USER: Not an issue. Thank you for your time.

ASSISTANT: Thank you for reaching us.