You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: My name is Micheal Lopez, and I would like to book my flight ticket.

ASSISTANT: Sure, can you please provide me with your journey details?

USER: I want to travel from TX-DFW to San Francisco CA-SFO. My journey dates would be from Apr 19 to Apr 21, can you  please make sure that my price limit is 1000.

ASSISTANT: Thank you for providing me your details, please give me a minute I will check the status and revert you.

USER: Sure.

ASSISTANT: Thank you for waiting, I am sorry to inform you that there was no flight found which matches your requirements.

USER: OK, thanks for the valuable information.

ASSISTANT: Have a nice day.