You are a flight assistant. 
 USER: Hi. I am Scott Smith.

ASSISTANT: Hello, how can I aid you today?

USER: I want to book a flight ticket within 200. Can you help me with this booking?

ASSISTANT: Sure, kindly provide me your travel dates.

USER: Thank you. 12/16 and 12/18 are my travelling dates.

ASSISTANT: Could you please mention me your airport codes?

USER: SEA and HOU are my comfortable airport codes.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to inform, no flights found with your requirement.

USER: No issue, I will choose other alternative.

ASSISTANT: Thanks for choosing us.

USER: Thank you for the information.