You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Please book a ticket from HOU to MSP to meet my friends.

ASSISTANT: Sure, may I know your trip dates please?

USER: I have planned to travel on Oct 20th and return on Oct 22nd.

ASSISTANT: Do you have any other requirements?

USER: I like to fly normal cost airlines.

ASSISTANT: Can I know your name please?

USER: Myself Carol Smith.

ASSISTANT: Please wait for a while.

USER: Ok, will wait for your response.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: Ok, no problem. Any way thank you.

ASSISTANT: My pleasure.