You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you now?

USER: I am Dennis Collins here, I want to reserve my ticket from DCA to DEN, can you please help me to book a ticket?

ASSISTANT: Sure, can you please mention the travelling dates of your journey?

USER: Sure, my dates of journey is from 07/27 to 07/29. Please make sure that the connections limit is 1.

ASSISTANT: Thank you for your information, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry Dennis, there is no reservation found on your name.

USER: Ok, no problem.

ASSISTANT: Thank you for approaching us, have a nice day.

USER: Thank you for your service.

ASSISTANT: You are welcome.