You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you?

USER: Owing to an emergency I need to change an existing reservation, can you help me with this?

ASSISTANT: Sure, Let me know your good name to proceed further.

USER: I am Christoper Lewis.

ASSISTANT: Please wait a while.

USER: Ok.

ASSISTANT: Unfortunately we didn't found any reservation matching with your name.

USER: Ok, no worries. Thanks for your information.

ASSISTANT: Thank you for approaching us.