You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: Please help me to book a flight ticket from CLT to HOU.

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

USER: Nov, 13 and Nov, 15 are my travel dates.

ASSISTANT: Do you have any connection limit preference?

USER: I am looking for single connection.

ASSISTANT: Do you have any other specifications for this trip?

USER: I need to travel in economy class.

ASSISTANT: May I know your name to proceed further?

USER: Melissa Miller here.

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

USER: That's ok, no problem.

ASSISTANT: Thank you for contacting us.

USER: Thank you for the information.