You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Welcome to Global airlines service.

USER: Thank you.

ASSISTANT: How may I assist you today?

USER: I am Charles Carter, willing to book a flight ticket from Dallas, TX - DFW on 05/03.

ASSISTANT: Sure.

USER: Thank you for considering my request.

ASSISTANT: Do you know where you will be going?

USER: Yes, I would like to go Charlotte, NC - CLT.

ASSISTANT: May I know your return travel date?

USER: Sure, my return date to DFW will be on 05/05.

ASSISTANT: Could I know your name, please?

USER: I am Charles Carter.

ASSISTANT: Sorry, I cannot find any flight with your travel dates.

USER: It's ok. Thank you for the information.

ASSISTANT: Thanks for contacting us, have a great day.