You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am Emily Roberts here, I would like to reserve my ticket within the price limit 500, can you please help me to book a ticket?

ASSISTANT: Sure, I will help you out.

USER: Thank you.

ASSISTANT: May I know your travelling dates please?

USER: Sure, my dates of journey is from 01/18 to 01/20.

ASSISTANT: Can I know your airport codes too?

USER: Ok, my respective airports codes are from DTW to JFK.

ASSISTANT: Ok, please wait a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, there are no flights found.

USER: Ok, no problem.

ASSISTANT: Thank you for choosing us.