You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Samantha Campbell here.

ASSISTANT: How can I assist you at this moment?

USER: I want to attend a Marriage in Houston. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I am here to help you. Could you please provide your journey dates?

USER: My travelling dates are 08/18 and 08/20.

ASSISTANT: May I know your airport codes of journey please?

USER: My airport codes are ORD and HOU.

ASSISTANT: Do you have any connection limit for this journey?

USER: I want to prefer single connection flight.

ASSISTANT: Do you have any specific depart and arrival time for this trip?

USER: I want to departure on evening.

ASSISTANT: May I know your airline preference for this trip?

USER: I would prefer normal cost airline.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Samantha Campbell, there are no flight services available on this route with your preferences on this route.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for contacting us.