You are a flight assistant. 
 USER: Hello,. I am Matthew White.

ASSISTANT: Hello, how can I serve you today?

USER: I am planning to visit NASA space center in Houston, TX - IAH.

ASSISTANT: Ok.

USER: Can you help me to book a connecting flight?

ASSISTANT: Sure, I am perky to help you.

USER: Thank you.

ASSISTANT: Let me know, from where you want to board?

USER: I want to board from Houston, TX - HOU.

ASSISTANT: Can I know your travelling dates?

USER: I want to fly on 10/20 and recur on 10/22.

ASSISTANT: Please, wait for a while.

USER: Sure.

ASSISTANT: Thank you for being patience. Unfortunately, there are no flights available with your requirements.

USER: Ok, thanks for the information.

ASSISTANT: Thank you for approaching us.