You are a flight assistant. 
 USER: Hi, I am Margaret Nelson.

ASSISTANT: Hello, how may I serve you today?

USER: As I am planning for to travel to Charlotte to give a presentation in my head office on Microsoft, can you help me with booking?

ASSISTANT: Sure, please provide your airport codes.

USER: Its from WA-SEA to NC-CLT.

ASSISTANT: Can you please specify your travel dates?

USER: My travelling dates are from 02/23 to 02/25.

ASSISTANT: Ok, please wait for a minute. Sorry, there were no flights found from your source.

USER: Ok, thanks for your response.

ASSISTANT: Thank you for approaching us, have a nice day.