You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER: I want to change my existing reservation which is done recently due to some problems, can you please help me out?

ASSISTANT: Sure, I can help you in that.

USER: Thank you.

ASSISTANT: For that I need to know your name. Can you please provide me?

USER: Sure, my name is Matthew Thomas.

ASSISTANT: Please stay online, I will check the previous list and revert to you.

USER: Sure, I will wait.

ASSISTANT: We are sorry to say that, there is no active reservation found on your name.

USER: Ok, not an issue. Thank you for your service.

ASSISTANT: Thanks for consulting with us.