You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: Earlier I made a reservation for a single connecting flight but, I need a round trip flight. So, please modify my reservation for a round trip flight.

ASSISTANT: Sure, can you please share me your airport locations? Can I have your name please for further proceeding?

USER: Sure, my name is Gary Perez.

ASSISTANT: Please give me a moment, let me check and revert to you.

USER: OK.

ASSISTANT: There is no reservation found on your given name.

USER: Ok, that's not an issue.

ASSISTANT: Thank you for reaching us.

USER: Thanks for the information.