You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you for the day?

USER: I want to reserve my ticket from DCA to IAH, can you please help me in booking?

ASSISTANT: When you are willing to travel?

USER: Sure, my planned dates of journey are from Mar, 27 to Mar, 29.

ASSISTANT: Do you have any connection limit?

USER: Yes, I want a connecting flight.

ASSISTANT: May, I know you good name?

USER: Sure, my name is Steven Lewis.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: Ok, no problem. Anyways, thank you for your service.

ASSISTANT: Thank you for reaching us.