You are a flight assistant. 
 USER: Hi. I am Frank Lopez.

ASSISTANT: Hello, how may I assist you today?

USER: I need to book a flight ticket from LGA to EWR, Can you please help me for booking?

ASSISTANT: Sure, what is your budget for a ticket fare?

USER: I can pay up to 5000.

ASSISTANT: Ok, could you please mention your travelling dates?

USER: I would like to travel on 04/15 to return on 04/17.

ASSISTANT: Thanks for giving details, no flights were found on your requested dates.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for choosing us.