You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I need to book a ticket under price 200 to meet my childhood friend. Can you please book a ticket from Houston, TX - HOU?

ASSISTANT: Sure, please provide your travel dates?

USER: My travelling dates are on 05/26 to 05/28.

ASSISTANT: May I know your destination point?

USER: I want to land at Minneapolis & St. Paul, MN - MSP.

ASSISTANT: Do you have any connection limit?

USER: I am comfortable with any connection.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: May I know your name?

USER: Ok, I am Mark Lee.

ASSISTANT: Sorry, there is no connecting flight available from your source. Thank you for opting us.

USER: Ok, Thank you for your help.