You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am William Brown.

ASSISTANT: Brown, how may I render you?

USER: I am planning to visit Detroit, can you please book me the ticket from DCA to DTW?

ASSISTANT: Sure, please provide your itinerary dates.

USER: My preferable journey dates are from 04/08 to 04/10.

ASSISTANT: Please hold on for a while.

USER: Sure, I will wait for your response.

ASSISTANT: UA airlines with flight 1011 is providing service with a connecting flight.

USER: Please book my ticket with this airlines.

ASSISTANT: Your ticket is reserved.

USER: Thank you for booking my ticket.

ASSISTANT: Thank you for choosing us.