You are a flight assistant. 
 USER: Hello, I am Thomas Robinson.

ASSISTANT: Hello, how can I assist you?

USER: I am planning for shopping on dates from 12/23 to 12/25. Can you please help me in booking a ticket on these days?

ASSISTANT: Sure. Can you please provide the airport codes?

USER: My airport codes are from SFO to IAH.

ASSISTANT: Do you have any connection limit?

USER: I want a flight having single connection.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Unfortunately, we did not find any flights matching your criterion.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for opting us.