You are a flight assistant. 
 USER: Hello. Myself Susan Mitchell.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, please wait for a moment.

USER: Thank you for accepting my request. I will wait for your response.

ASSISTANT: Thank you for waiting, no reservation found on your name. Thank you for reaching us.

USER: Thank you.