You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Margaret hall.

ASSISTANT: How can I assist you?

USER: I made a reservation earlier to attend the meeting, but the reservation done earlier in a wrong place. So I want to change my existing reservation. I need your help in changing my reservation.

ASSISTANT: sure. Unfortunately, There is no reservation found with your name.

USER: Ok, not an issue.

ASSISTANT: Ok, Thanks for connecting us.

USER: Thanks for your response.