You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How can I amend you today?

USER: Me and my friends are planning to go for shopping for buying some accessories at Houston.

ASSISTANT: Ok.

USER: Could you help me with booking a connecting flight?

ASSISTANT: Sure, we are glad to you.

USER: Thank you.

ASSISTANT: When are you willing to travel?

USER: I would like to depart on 07/26 and return on 07/28.

ASSISTANT: To proceed further I need your airport codes.

USER: My journey points are from CO-DEN to TX-HOU.

ASSISTANT: Sorry, there is no flight found to your route. Let me know your name for documentation purpose.

USER: That's ok. I am Sarah Adams.

ASSISTANT: Thank you for opting us.

USER: Thank you for your assistance.