You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Due to some emergency I need to change my existing reservation. Can you help me in changing my reservation?

ASSISTANT: Sure, we are here to assist you.

USER: Thank you.

ASSISTANT: Please provide your name to proceed further.

USER: I am Joshua Williams.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for being patient, There was no reservation found on your given name to change it.

USER: No problem. Thank you for the information.

ASSISTANT: Thank you for approaching us.