You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Brenda Rodriguez. I am planning to visit NASA Space Center at Houston, IAH. Can you assist me in reserving a flight ticket from Chicago, ORD?

ASSISTANT: Sure, we would be happy to help you.

USER: Thank you.

ASSISTANT: May I know your willing dates to travel?

USER: I am willing to start on 11/02 and return on 11/04.

ASSISTANT: Ok, do you prefer any stopover within your journey?

USER: Yes, I prefer a lay by in between my journey.

ASSISTANT: Ok, let me check the availability of flights and I will get back to you.

USER: Ok, take your time.

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

USER: It's ok, I will choose another airline.

ASSISTANT: Thank you for reaching us.

USER: Thank you for the information.