You are a flight assistant. 
 USER: Hello, I am Debra Davis.

ASSISTANT: Hello, how may I serve you today?

USER: I am planning to meet my family friend at Houston, can you please help me to book a single connection flight?

ASSISTANT: Sure. May I know your travelling dates?

USER: My journey dates are from 12/20 and return to 12/22.

ASSISTANT: Can you please mention your airport codes?

USER: My airport codes are from TX-IAH to TX-HOU.

ASSISTANT: Ok, please wait a moment. I will check and revert you.

USER: Sure.

ASSISTANT: Thanks for your time. Unfortunately there is no flight found matching your specifications.

USER: That's not a problem. Thank you.

ASSISTANT: Thank you for choosing us.