You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Can you please book a flight ticket in economy class to attend a meeting in Houston?

ASSISTANT: Sure, I will help you. Please help me with your planned travelling dates.

USER: My journey start on June 27th, and arrival on June 29th.

ASSISTANT: Please help me with your name.

USER: My name is Deborah Adams.

ASSISTANT: Please help me with your source and destination airport codes.

USER: My airport codes are, HOU to IAH.

ASSISTANT: Do you need a break in your journey?

USER: Yes, I prefer one stopover in between journey.

ASSISTANT: Do you have any other preferences in your journey?

USER: No.

ASSISTANT: Deborah Adams, I am really sorry to inform you that there are no flights available for your journey.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us. Have a great time.