You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you?

USER: I am Rebecca Collins. I am planning to meet my friend at Washington, DCA. Can you please book a ticket for me?

ASSISTANT: Sure, we can help you. Please provide me your travelling dates.

USER: Trip dates are 08/01 to 08/03.

ASSISTANT: Do you require any stopovers in your journey?

USER: Yes, I need halt in between my journey.

ASSISTANT: From which airport you will start your journey?

USER: Source code is Houston, IAH.

ASSISTANT: Ok, let me check the availability.

USER: Ok.

ASSISTANT: Sorry to say you that there is no flight available on your schedule dates.

USER: No problem. Thank you.

ASSISTANT: Thank you for consulting us.