You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I support you?

USER: Can you help me with booking ticket from IAH to DCA?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your itinerary dates?

USER: Ok, my trip dates are from May 26 to 28.

ASSISTANT: Is there any specific time to travel?

USER: I don't have any kind of preferences.

ASSISTANT: Do you need any way station in your journey?

USER: No.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: Sorry to inform you that, there are no flights available on your request.

USER: It's ok, thanks for checking.

ASSISTANT: for documentation, may I know your name please?

USER: Sure, I am Ruth Lewis.

ASSISTANT: Thank you for reaching us.