You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you at this moment?

USER: My friend told me to change his reservation because he want to stay with his mother for some more days. Can you please help me to change his reservation?

ASSISTANT: Sure, I will help you with this.

USER: Thank you.

ASSISTANT: Can you please provide the name on which the ticket has been booked previously?

USER: The ticket was booked on the name of Ruth Edwards.

ASSISTANT: There is no active reservation found with the name Ruth Edwards in our database.

USER: That's fine, thank you for checking.

ASSISTANT: Thank you for contacting us.