You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. By which way, can I serve you today?

USER: Actually I have planned a trip to enjoy my weekend. But, unfortunately I have misplaced the month while booking. So, I need to change my reservation. Can you please help me with this?

ASSISTANT:  Sure, I can help you in that. To proceed further, we need your name. Can you provide it?

USER: Sure, I am Justin Brown from Los Angeles.

ASSISTANT: Thank you for your name, please wait.

USER: Sure.

ASSISTANT: Sorry Justin Brown, no active reservation found on your name to change it.

USER: Ok. Thank you for your service.

ASSISTANT: Please check it with another airlines, it may be useful to you. Thanks for choosing us, have a great day!.