You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you?

USER: Actually, I made a reservation earlier to go for a holiday vacations.

ASSISTANT: Ok.

USER: But now, I want to change the reservation due to some issues. Please help me in this with the name of Robert Walker.

ASSISTANT: Sure, please be on hold.

USER: Ok.

ASSISTANT: We do not found any active reservation in your name.

USER: No problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.