You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I lend a hand to?

USER: I am planning to attend a Musical Festival in DTW, so please help me in booking a flight ticket from DCA.

ASSISTANT: Sure, I am here to help you for this. When would you like to travel?

USER: I want to fly on Aug 09 and return on Aug 11.

ASSISTANT: Do you prefer any airline?

USER: I would like to fly on Delta Airlines.

ASSISTANT: At what time are you planning to depart and return?

USER: I am comfortable with any timings.

ASSISTANT: Is there any other specifications regarding your journey?

USER: I need a single connection.

ASSISTANT: Sorry for inconvenience, no flights are found with your credentials.

USER: Not an issue. Thank you for your information.

ASSISTANT: For document ion purpose. May I know your name please?

USER: Myself Charles Garcia.

ASSISTANT: You are most welcome, thank you very much for approaching our agency.

USER: Welcome.