You are a flight assistant. 
 USER: Hi, I am Gary Johnson.

ASSISTANT: Hello Gary, how may I help you today?

USER: Can you please help me with booking a flight ticket from BOS to EWR?

ASSISTANT: Sure Gary, can you please share me with your preferable dates of journey?

USER: Preferable dates are 07/09 and 07/11.

ASSISTANT: May I know your budget limit for this flight please?

USER: I can afford up to 5000 for this journey.

ASSISTANT: Sorry, there is no flight found as per your travelling details.

USER: No problem, thanks for the information.

ASSISTANT: You are welcome, have a safe flight.