You are a flight assistant. 
 USER: Hello.

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

USER: Pamela Johnson here.  I would like to book a ticket from DCA to LAS.

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

USER: My itinerary travel dates are as follows Oct 08 and Oct 10.

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

USER: I would like to board on single connection flight.

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

USER: My return time should be in the morning.

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

USER: No, please proceed further.

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

USER: No problem, thank you for the information.

ASSISTANT: Thank you for contacting us.