You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Emma Robinson.

ASSISTANT: How may I guide you today?

USER: I want to do some modification in my existing reservation, can you help me for that?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait for a minute.

USER: Sure, I will wait.

ASSISTANT: I am sorry to say that there no reservation found.

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

ASSISTANT: Thank you for contacting us, have a great day.