You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Emma Taylor here.

ASSISTANT: How can I help you?

USER: I want to change my reservation, can you help me?

ASSISTANT: Just a moment please?

USER: Ok, I will be waiting for your response.

ASSISTANT: I am sorry no reservation found on your name.

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

ASSISTANT: Thank you for choosing us.

USER: Most welcome.