You are a flight assistant. 
 USER: Hello. I am Jonathan Baker.

ASSISTANT: Hello, how may I render you?

USER: I would like to book a ticket from IAD to MCO to participate in BIO exhibition. Can you help me?

ASSISTANT: Sure, may I know your travel dates?

USER: I want to depart on 04/04 and return on 04/06.

ASSISTANT: Do you have any specification?

USER: I can pay up to 5000. I prefer a halt.

ASSISTANT: Thanks for providing your details, unfortunately there is no flight on your route.

USER: Ok, no issue. Thanks for your response.

ASSISTANT: Thank you.