You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Nicholas Adams. I planned to attend for a wedding in SFO, can you please help me to book a flight ticket from HOU?

ASSISTANT: Sure, may I know your trip dates?

USER: I prefer to travel on 01/30 and 02/01.

ASSISTANT: The Spirit airline with flight number 1020 is available having price as 400 and connection as 1.

USER: Can you please search for a flight with price 200?

ASSISTANT: Sorry, there is no flight within the range of 200.

USER: Ok, that's fine. Thank you for your help.

ASSISTANT: You are welcome.