You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Angela Adams.

ASSISTANT: How can I aid you at this moment?

USER: Can you help me in booking my flight ticket from Dec 30 to Jan 1st?

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

USER: My source point is IAH, my landing point will be on CO-DEN.

ASSISTANT: Do you need any connection limit for this trip?

USER: I need a connecting flight.

ASSISTANT: May I know your airline preference?

USER: I am ok, with any airline.

ASSISTANT: Do you have any class preference for this trip?

USER: No.

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

USER: My depart time is in the afternoon.

ASSISTANT: Angela Adams, we regret to inform you that there are no flight services are available with your preferences on this route.

USER: Its ok, thank you.

ASSISTANT: Thank you for opting us.