You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Matthew Walker, can you change my recent reservation please?

ASSISTANT: Sure, please give me a minute.

USER: Ok, take your own time.

ASSISTANT: Walker, there is no reservation available on your name.

USER: That's ok, thank you for assisting me.

ASSISTANT: You are welcome.