You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My self Charles White.

ASSISTANT: Charles, how may I aid you?

USER: I am planning to attend business meeting at Philadelphia, can you please help me with booking a flight ticket?

ASSISTANT: Charles, I am happy to help you. Can you please help me with your source and destination airport codes?

USER: I planned my journey from MSP to PHL.

ASSISTANT: Noted, can you please let me know your itinerary dates?

USER: I prefer to travel on 03/28 and would like to return on 03/30.

ASSISTANT: Ok, please wait for a while.

USER: Sure, I will wait for your reply.

ASSISTANT: Sorry Charles, there is no flight available on your preferred dates.

USER: It's ok, not an issue. Thank you for the information.

ASSISTANT: You are welcome, thank you for contacting our agency.