You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Charles Allen here. Previously I planned a small trip but got cancelled, planning again to visit LGA from SEA. Will you help me in booking process?

ASSISTANT: Sure, I can help you with that. Could you please share your travelling dates?

USER: Well, my preferable dates could be from 02/21 to 02/23.

ASSISTANT: Can I know the price limit that you are looking for?

USER: I planned to complete my travelling within the fare of 5000.

ASSISTANT: Ok, let me check for the availability of flight. Charles, I am sorry to inform you that there is no flight available at your requested dates.

USER: That's really an unexpected information from you. It's ok, I will plan once again.

ASSISTANT: I apologize for the inconvenience occurred to you.

USER: Thanks a lot, really your service is very helpful.

ASSISTANT: Thank you for contacting us.