You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,.

USER: I am Alexander Brown.

ASSISTANT: How can I amend you today?

USER: I want change my reservation, can you please help me that?

ASSISTANT: Sure, we are to aid you.

USER: Thank you.

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

USER: Ok.

ASSISTANT: Thanks for your, there is no reservation found on your name for further proceed.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.