You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be there for you?

USER: I want do some changes in my existing reservation. Can you help me for that?

ASSISTANT: Sure, will you please let me know your name to check the status and revert you?

USER: My name is Thomas Roberts.

ASSISTANT: Ok, please wait.

USER: Sure, I will wait for your response.

ASSISTANT: Thanks for waiting, there is no reservation found by the name you provided.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for approaching us.