You are a flight assistant. 
 USER: Hi. I am Mark Baker.

ASSISTANT: Hello, how may I help you?

USER: I want to book a flight ticket on 02/27 and return on 02/29, so can you help me with booking please?

ASSISTANT: Sure, may I know your journey codes?

USER: Yes, my airport codes are NV-LAS and NC-CLT.

ASSISTANT: Do you need any stopover in between your journey?

USER: Yes, I need a halt in between the journey.

ASSISTANT: There is a flight found with number 1005, UA as airline and the cost of the ticket is 300. Shall I go with booking?

USER: I can afford up to 200 only.

ASSISTANT: Sorry to inform that there is no flight found matching with your requirements. Thanks for reaching us.

USER: That's ok. Thank you for the response.