You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you now?

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

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

USER: Ok, my dates of journey is from 09/23 to 09/25.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: May I know your name please?

USER: My name is Jonathan Green.

ASSISTANT: Sorry, there are no flights found on your requested dates.

USER: Ok, no problem.

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

USER: Thank you for your service.

ASSISTANT: You are welcome.