You are a flight assistant. 
 USER: Hi, I am Anna Edwards.

ASSISTANT: Hello, how can I assist you at this moment?

USER: I want to book a flight ticket.So, can you book a connecting flight under normal cost?

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

USER:  I am planning my trip on Jan 22, and again I will return back on Jan 24.

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

USER: Airport codes are EWR and LGA.

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

USER: I would like to depart at evening.

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

USER: No.

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

USER: No problem. Thanks for the help.

ASSISTANT: Thank you for contacting us.